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1·This meeting has been, without doubt, one of the most useful we have had so far.

这无疑是我们迄今为止最有用的一次会议。《牛津词典》

2·Some people think one of the most useful inventions is the smartphone.

一些人认为最有用的发明之一是智能手机。

3·Sage (鼠尾草) is one of the most useful plants in the world.

鼠尾草是世界上最有用的植物之一。

4·Mobile phones are one of the most useful inventions of the last 50 years, but not everything that is said about them is good.

手机是过去50年里最有用的发明之一，但并不是所有关于它们的说法都是正面的。

5·Which is the most useful invention?

哪一个是最有用的发明？

6·A picture of eating chips is the most useful.

吃薯片的图片是最有用的。

7·It is still true that a dog is the most useful animal in the world.

狗是世界上最有用的动物，这一点仍然是正确的。

8·Fail—a noun or interjection used when something is egregiously unsuccessful—was 2009's the most useful word.

失败——“名词或感叹词，当某事非常不成功时使用”——被评为2009年最有用的单词。

9·Anger is not necessarily the most useful or acceptable reaction to such events.

生气未必是对待此类事件最有用或最适合的反应。《柯林斯英汉双解大词典》

10·Pilots found them most useful while flying.

飞行员们发现它们在飞行时最有用。