Leave a gap at the top and bottom so air can circulate.
在顶部和底部各留一点空隙，这样空气就可以流通了。
All this is so elementary that one would blush to state it if it were not being constantly forgotten by those who coin and circulate the new slogans.
所有这一切都是如此初级，以至于如果不是那些杜撰和传播新口号的人一再忘记它，人们都羞于陈述。
Mercury has no atmosphere to speak of, so there's no way for heat to circulate from the hot regions into the craters.
值得一提的是水星没有大气层，所以没有可以从高热量区向陨石流通的热能。
Separators are designed to hold the plates apart so that they do not touch, and at the same time they must be porous enough to permit liquid to circulate between the plates.
隔板用来把极板隔开，以防止各极板间相互接触，但同时隔板又必须具有多孔性，使电解液能够在各极板间流动。
Separators are designed to hold the plates apart so that they do not touch, and at the same time they must be porous enough to permit liquid to circulate between the plates.
隔板用来把极板隔开，以防止各极板间相互接触，但同时隔板又必须具有多孔性，使电解液能够在各极板间流动。
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