useful

A Swiss Army knife is a very useful tool to have when you are camping in the woods.

(Chinese) 在森林里露营时，瑞士军刀是一个非常有用的工具。

He gave me some useful advice on how to prepare for a successful job interview.

(Chinese) 他给我提供了一些关于如何准备一次成功的求职面试的有用建议。