boom out

Then cannons began to boom out over the city. Crowds rushed to the White House to cheer the president.

城中大炮轰鸣，人们纷纷跑到白宫，在总统身边欢呼。

Middlesbrough is full of security cameras attached to loudspeakers, which occasionally boom out warnings to miscreants.

米德尔斯堡布满了带有扬声器的监控摄像，不时地对歹徒发出警告。