Milk will go bad if it is kept for a long time, especially if it is not kept cold.
鲜奶在保存了很长一段时间之后就很容易变质，特别是没有在低温下保存的时候。
This piece of meat has been kept for a long time, as if it has gone bad.
这块肉放了好长时间了，好象坏了。
He did not want his bad luck to come back. So he kept his fingers crossed-all the time.
他不希望厄运回来，所以他保持食指跟中指交叉以祈求好运。
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