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Respiration becomes difficult at great heights.是什么意思？

Respiration becomes difficult at great heights.

在很高的地方呼吸就变得很难。

相关词汇
respiration becomes difficult at great heights

respiration

n. 呼吸，一次呼吸，（植物的）呼吸，一息；

becomes

v. 变为，成为( become的第三人称单数 )，适合，使（人）显得漂亮，使好看；

difficult

adj. 困难的，难做的，难解的，不易相处的；

at

prep. （表示位置）在，在（某时间或时刻），以，达， 向，朝；n. 阿特（老挝辅币单位，100 阿特 = 1 基普）；

great

adj. 伟大的，杰出的，优异的，显著的，很多的，重大的；adv. [口语]很好地，令人满意地，成功地，顺利地，得意地；n. 大人物们，伟大人物，重要人物，大师，名家；

heights

n. 高度( height的名词复数 )，顶点，高处，极端；
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