错误的信念虽然在事实意义上没有用，但从社会意义的角度来讲是有用的。

False beliefs can be useful in a social sense even if they are not useful in a factual sense.

youdao

验证非常有用—毕竟，如果应用程序不能识别那些元素，处理文档又有什么意义呢？

Validating is useful — after all, what's the point in processing documents if the application does not recognize the elements?

youdao

特性是对用户有用和有意义的一项功能。

A Feature is a function useful and meaningful to users.

youdao

And the reason I was able to do that and keep with what my original intentions were was to have a career that was the fulfilling, in terms of helping people and being engaged in science, is all of a sudden I realized, as chemists, we can think about better ways to build molecules that are important for making medications.

我能够这么做,并且能不和我原来的打算冲突,是因为我的职业很有意义，能帮助他人，又和科学相关,于是突然我意思到，作为一个化学家,我们可以思考出更好的办法,制造出在制药方面十分有用的分子。

麻省理工公开课 - 化学原理课程节选