An autoimmune disease results when the body's system for fighting infection (the immune system) turns against a part of the body.
自体免疫疾病是因身体（免疫系统）对抗感染时转而攻击身体的某一部分而产生的。
However, when animal-based protein is eaten, this defense mechanism turns against us and converts these chemicals into carcinogen.
但是，当进食动物蛋白时，这种防御机制就会转而和我们作对，将这些化学物质转变成致癌物。
Europe has become an international credit rating agencies take turns "against" the object.
欧洲各国已成为国际信用评级机构的轮番“打击”对象。
But if the market eventually turns against him his capital may be wiped out.
但是如果市场最终掉头急转直下，他们资本也许会一笔勾销。
If the rally resumes, we'll make money, but if the market turns against us, the loss will be small.
如果上涨继续，我们就赚钱；但是如果市场下跌，亏损也不多。
He has a clear notion of how he'll get in, where he'll take profits, and where he'll accept a loss if the market turns against him.
他很清楚如何进场，在哪里兑现利润，如果市场不好，他知道在何处接受亏损。
I'm falling to pieces. Everything turns against me.
乱糟糟的，什么都不顺。
Even your wardrobe turns against you.
连你的衣柜也跟你对着干。
I am falling to pieces. Everything turns against to me.
我崩溃了。所有事情都在跟我作对。
vice versa, turns against, the other side which turns, usually denotes the other side of a question or idea
反之亦然（常指某一问题或观点的另一面）
Cuz I'm by your side when the whole world turns against you
因为当全世界都背叛你的时候我在你身边
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