Some people are so terribly insincere you can never tell if they are telling the truth.

有些人非常虚伪，你根本说不准他们是否在讲实话。

柯林斯例句

But of course you can never tell; people are such hypocrites.

但是,当然啦,这是无法预料的, 人们总是这么虚伪.

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You can never tell.

这可谁也说不准.

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You can never tell what small pebble it will pick up away among its treasured things.

你永远无法知道它会拣起哪块小石头珍藏起来.

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