1.[i][t]破裂；裂开；断裂to break without dividing into separate parts; to break sth in this way
The ice cracked as I stepped onto it.我一踩冰就裂了。
He has cracked a bone in his arm.他的手臂有一处骨裂。
Her lips were dry and cracked.她的嘴唇干裂了。
2.[i][t]砸开；破开；砸碎；打碎to break open or into pieces; to break sth in this way
A chunk of the cliff had cracked off in a storm.悬崖上的一块石头在暴风雨中崩塌下来。
His face cracked into a smile.他脸上绽放了微笑。
to crack a nut把坚果砸开
She cracked an egg into the pan.她往锅里打了一个鸡蛋。
3.[t]~ sth/sb (on/against sth)重击；猛击to hit sth/sb with a short hard blow
I cracked my head on the low ceiling.我的头撞上了低矮的天花板。
He cracked me on the head with a ruler.他用尺子猛击我的头部。
4.[i][t]（使）发出爆裂声，噼啪作响to make a sharp sound; to make sth do this
A shot cracked across the ridge.一颗炮弹飞过山脊爆炸了。
He cracked his whip and galloped away.他抽响鞭子，策马飞奔而去。
5.[i]（突然）变嘶哑，变沙哑if your voicecracks , it changes in depth, volume, etc. suddenly and in a way that you cannot control
In a voice cracking with emotion, he told us of his son's death.他悲恸失声地告诉我们他儿子去世的消息。
6.[i]（因压力而）吃不消，崩溃，瓦解to no longer be able to function normally because of pressure
Things are terrible at work and people are cracking under the strain.工作情况很糟糕，人们因过度紧张越来越吃不消了。
They questioned him for days before he cracked.他们审讯他多日后他就垮掉了。
The old institutions are cracking.旧的制度正在瓦解。
7.[t]~ sth找到解决（难题等的）方法to find the solution to a problem, etc.; to find the way to do sth difficult
to crack the enemy's code破译敌人的密码
After a year in this job I think I've got it cracked !干了一年后，我觉得我已知道怎样做好这项工作了！
8.[t]~ sth阻止，打击，击败，战胜（罪犯或敌人）to find a way of stopping or defeating a criminal or an enemy
Police have cracked a major drugs ring.警方破获了一个重大的贩毒集团。
9.[t](informal)~ (open) a bottle开瓶；（尤指）开瓶饮酒to open a bottle, especially of wine, and drink it
10.[t](informal)~ a joke说（笑话）；开（玩笑）to tell a joke
There's a lot to be done, so let's get cracking.要做的工作很多，咱们马上就干吧。
There's a lot to be done, so let's get cracking.要做的工作很多，咱们马上就干吧。
He's not nearly such a good writer as he's cracked up to be.他远不是人们所说的那种优秀作家。
He's not nearly such a good writer as he's cracked up to be.他远不是人们所说的那种优秀作家。
1.[c]~ (in sth)裂纹；裂缝a line on the surface of sth where it has broken but not split into separate parts
This cup has a crack in it.这杯子有一道裂痕。
Cracks began to appear in the walls.墙壁开始出现裂缝了。
The cracks(= faults) in the government's economic policy are already beginning to show.政府经济政策中的失误已开始显露出来。
2.[c]缝隙；狭缝；窄缝a narrow space or opening
She peeped through the crack in the curtains.她透过窗帘的缝隙窥视。
The door opened a crack(= a small amount) .那门开了一条缝。
3.[c]（突然的）爆裂声，噼啪声a sudden loud noise
a crack of thunder一声霹雳
the sharp crack of a rifle shot尖厉的步枪声
4.[c]~ (on sth)（可听到响声的）重击，猛击a sharp blow that can be heard
She fell over and got a nasty crack on the head.她跌倒了，脑袋重重地磕了一下。
5.[c](informal)~ (at sth).~ (at doing sth)尝试；试做an occasion when you try to do sth
She hopes to have another crack at the world record this year.她希望今年再一次冲击世界纪录。
6.[u]强效可卡因a powerful, illegal drug that is a form of cocaine
a crack addict吸强效可卡因成瘾的人
7.[c](informal)（尤指挖苦人的）玩笑，俏皮话a joke, especially a critical one
He made a very unfair crack about her looks.他开玩笑地损了一下她的长相，言语很是刻薄。
8.[u][sing](informal)好时光；友好愉快的交谈a good time; friendly, enjoyable talk
Where's the crack tonight?今晚去哪里逍遥？
He's a person who enjoys a drink and a bit of crack.他是个喜欢喝两杯又爱聊天的人。
1.[obn]训练有素的；技艺高超的；优秀的；一流的expert and highly trained; excellent at sth
crack troops精锐部队
He's a crack shot(= accurate and skilled at shooting) .他是个神枪手。
The door opens just a crack and a single arm emerges with a ticket in hand.
只见厕所门打开一条小缝，一只举着一张车票的手伸了出来。
Except for a small length of web at the first fracture location, none of the cracks exhibited a brittle fracture mode of crack propagation.
除第一个断裂位置的一小段腹板外，没有一条裂纹显示出裂纹扩展的脆性断裂模式。
Deutsche Bank was an aggressive dealer in CDOs in the period when the market was beginning to crack.
在市场开始破裂时，德意志银行是担保债务凭证的积极经销商。
The next morning, he opened the drawer a crack to look at the snake's tail and was amazed to see that it had turned into human toes.
第二天早晨，当他把抽屉拉开一条缝去看那段尾巴，然而惊奇的发现尾巴变成了人的脚趾。
West Berliner looking into East Berlin through a crack in the Berlin Wall at the time of it's construction.
一个西柏林男人透过正在修建当中的柏林墙墙上的缝隙观察东德。
Real interaction with the child is particularly crucial when the child is trying to 'crack the code' of speech.
父母与孩子的真正交流是极其重要的，特别是在孩子试图“解码”语言的时候。
"A large crack appears in the wall of the Yushu Hotel, and part of a government office building also collapsed, " he said.
玉树酒店的墙壁上出现一道大裂缝，并且部分的政府办公大楼也倒塌了。
Now he began leisurely to take off his clothes, but stopped first with his coat, and tucked it along the crack under the door.
现在他开始不慌不忙地脱衣服，但是他先只脱了上衣，用它塞住门下的缝隙。
The system is designed primarily to crack down on ticket scalpers whose business has developed into a major industry.
该制度主要旨在打击倒卖车票的黄牛党，其贩票生意几已形成一个庞大的产业。
No longer will she have time to sit on the front porch steps on a summer day and watch an ant scurry across the crack in a sidewalk.
她不会再有时间坐在夏日的门廊台阶上，看着一队蚂蚁急匆匆地穿过人行道上的裂缝。
As authorities began to crack down on the ryle smugglers, Fortuna decided to quit the business.
当局开始清剿赖尔走私犯后，福图纳决定退出这一行。
you can see there are a lot of crack along the ceramic backing, they are very breakable and easy to be damaged.
但是你看在陶瓷衬垫旁边已经有很多裂缝。它们非常容易破碎
"Oh, can Pa have lost his mind? " thought Scarlett, and her throbbing head felt as if it would crack with this added strain.
“哦，难道爸爸已经失了神了吗？”思嘉一面想着，一面因受了这一新的刺激，觉得她的头要裂开了。
He took me into the corridor where the basement door is and showed me a large crack in the wall above the basement door.
可他却领着我来到走廊，来到地下室的门前，指着门上方墙体的一道裂缝给我看。
But she, thinking that he had raised his hand to slap her face, she gave him a sound crack in the jaw with that big peasant hand of hers.
说完他想拍拍她的脸蛋，她却以为菲尔莫举起手来是要扇她耳光，便用她那只乡巴佬的大手朝他下颚上响亮地抽了一记。
"The reason we spent a long time discussing it, was that we wanted to give every book a fair crack of the whip, " he said.
他还说：“我们之所以花这么长时间讨论，在于我们希望给每本书以公平的机会。”
The science of poker bots is still in its infancy, which may be one reason that some gambling sites do not crack down on them.
扑克智能程序方面的科学还处于起步阶段，这可能是有些赌博网站对智能程序不采取严厉措施的一个原因。
Conventional ultrasonic NDT method is quite incompetence for the surface fatigue crack testing of in service rotary shaft.
采用常规超声检测方法对在役转轴表面疲劳裂纹检测的效果很差。
The first was that of a small-time crack-cocaine dealer, Derrick Kimbrough, who had been sentenced to 15 years in prison.
在第一起案例中，不甚重要的强效可卡因毒品贩子，DerrickKimbrough，已被判处15年的监禁。
After been used for 3 - 4 months, the crucible had serious crack at the joint of the bottom and side closing to the outer flame.
镁合金热室压铸机所用坩埚在使用3~4个月后在靠近外焰的底部和侧面结合处发生严重的变形开裂，对开裂原因进行了分析。
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