It can be useful to write a short summary of your argument first.

先把你的论点纲要写下来可能会有帮助。

《牛津词典》

It was certainly useful to have her there to chauffeur him around.

有她在那儿为他开车肯定是有用的。

《柯林斯英汉双解大词典》

The drug will be useful to hundreds of thousands of infected people.

这种药物将会对成千上万感染者有用。

《柯林斯英汉双解大词典》

Lena Horne later said that she first became involved with Lennie Hayton because she thought he could be useful to her career.

VOA: special.2010.05.23

Now, it's also very useful to look at some of the relations that come out of these fundamental equations.

我们接下来可以考察,从这些基本方程中得出的一些方程。

麻省理工公开课 - 热力学与动力学课程节选

So I think you will find it useful to use this phrase for expressing yourself in many conversations.

你会发现，在许多对话中，这个句型能恰当地帮你表达自己的意思。

That's all课堂 - SpeakingMax英语口语达人

This information is highly useful to the cloud, if it can do something about it.

FORBES: Endpoints Ready For The Cloud

In the first few days, urine samples are useful to look for exposure to chemical agents.

BBC: Syria chemical weapons claims: UK and US tread cautiously

Mobile devices need to have enough digital storage to be useful to the user.

FORBES: Are Fat Tablets in Your Future?