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1·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》

2·He might be useful to us.

我们也许用得上他。《牛津词典》

3·A tripod will be useful to align and steady the camera.

三脚架会有助于对齐稳住照相机。《柯林斯英汉双解大词典》

4·Once our services cease to be useful to them, we're expendable.

一旦我们的服务对他们没了用，我们就是可消耗的了。《柯林斯英汉双解大词典》

5·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》

6·Some believe that gene editing could be useful to HIV patients.

一些人认为，基因编辑可能对艾滋病患者有用。

7·This could be useful to the agricultural industry.

这可能对农业有帮助。

8·I thought it would be useful to include some humor tips for everyday life.

我觉得在日常生活中加入一些幽默技巧会很有用。

9·I suppose it'd be useful to have the instructions that go with the camera too.

我想如果有与相机配套的说明也会很有用。

10·Tom had wit enough to perceive that here was a lad who could be useful to him.

汤姆很聪明，他知道这个小伙子会对他很有用。