The machine uses a technology that automatically adjusts the speed and tone of any song being played to match the tempo and key the singer is using.

这台机器使用了一种技术，可以自动调整任何正在播放的歌曲的速度和音调，以配合歌手所使用的节奏和音调。

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We keep our valuables under lock and key.

我们把贵重物品锁起来收好了。

《牛津词典》

He kept that book under lock and key.

他把那本书锁起来。

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Many of the Keys still have Spanish names, like Islamorada, Bahia Honda and Key Vaca.

VOA: special.2010.03.22

Now if you look at the structure of this book, it has sections that say Key Points and Key Terms.

如果你看了整本书的结构,就会看到有个关键点和关键词的部分

耶鲁公开课 - 金融市场课程节选

It's for both boys and girls. You can pick up loads of accessories and key items.

男女的东西都有。你可以找到很多饰品和主要的物件。

推荐古老店铺 - SpeakingMax英语口语达人

Walking through, it is easy to forget that women spent their entire lives here under lock and key.

BBC: Uncover the secrets of Topkapi Palace

The offense is struggling, their playoff hopes teetering and key players are missing practice.

WSJ: Knicks try to recover from illness, offensive woes

The former partners tried to keep Cawley's new claims under lock and key at the courthouse.

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