If only you knew about it.

你要是知道就好了。

youdao

If only YOU knew that.

要是你知道就好了。

youdao

Believe me, I am wrong so often, if only you knew.

相信我，我经常犯错，只是你们不知道罢了。

youdao

If you knew only the third derivative of the function, you can have something quadratic in t without changing the outcome.

如果方程里有三阶导数,你就可以引入一个二次项,但是结果却不会变

耶鲁公开课 - 基础物理课程节选

So, imagine growing up in a place like that where the past was so-- was written not only in the death of people that you knew, because everybody you knew died basically.

所以想像在这种地方长大,那种历史真是,不光写在那些你认识的死者上,因为你认识的基本上都死了

耶鲁公开课 - 1871年后的法国课程节选

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