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单词 lower stage
例句
原声例句
经济学人 Science and technology

The lower stages of its Falcon 9 rockets crashed and burned many times before the firm mastered the art of landing and re-using them, something that had not been done before.

在该公司掌握了着陆和重复使用它们的技术之前, 猎鹰 9 号火箭的下级曾多次坠毁和燃烧,这是以前从未做过的事情。

新东方优美短文背诵

For the next half hour or so, as you relax more and more, you will drift down through stage 2 and stage 3 sleep. The lower your stage of sleep the slower your brain waves will be.

在随后约半小时内,你进一步放松,进入第二和第三阶段睡眠。睡眠越深入,脑电波就越缓慢。

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