There's more than a grain of truth in that.

其中含有很深刻的道理。

柯林斯例句

Our observations may contain a grain of truth for you to refer to.

我们的意见也许会有千虑一得之处,供你参考.

《现代汉英综合大词典》

There isn't a grain of truth in what he said.

他说的全不是真话.

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There was a grain of truth in what he said.

他说的话中有一丝真理.

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