By contrast, Paris has for years enjoyed a network of five RER rapid cross-city underground lines.
与此不同,巴黎多年来都一直享受着由5条快速地下城铁组成的交通网络带来的便利。
The endoplasmic reticulum, a lacy array of membranous sacs, tubules, and vesicles, may be either rough(RER) or smooth (SER).
内质网,是一些不规则排列的膜囊,小管,和液泡组成的。
The endoplasmic reticulum, a lacy of membranous sacs, tubules, and vesicles, may be either rough(RER) or smooth (SER).
内质网,是一些不规则陈列的膜囊,小管,和液泡组成的。
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