According to the formation principle of the tritubercular cycloid in this paper, the rotor, whose bore curve is the inner envelope line of the cycloid, is made with the solid radius vector.
根据三尖
形成原理,以内包络为定子内腔曲,动径实体化后作为转子,定子、转子按照一定关系运动则形成一种
型泵。
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Because alveoli serve as critical exchange points between the blood and air from the outside world, they have their own specialized types of white blood cells, or macrophages, which defend against foreign organisms by enveloping and eating them.
因为肺泡相当于血液和来自体外的空气之间的一个临界交换点，它们拥有专门的白血
，
名巨噬，这种通过
络和吞噬外来来进行
。
生英语 2017年4月合集 
和
络
