This new dictionary is very useful [helpful] to me.

对我来说这本新词典很顶事。

《新英汉大辞典》

Note: Your anger can be useful, but only if you express it in a helpful way.

注意：只有当你以积极的方式表达愤怒时，你的愤怒才可能产生正面的作用。

youdao

I hope this article gave you a useful introduction to these helpful classes and methods.

我希望本文对这些有用的类和方法的介绍会对您有所帮助。

youdao