发现在近床壁处存在着二次流区，它与主体流区之间进行着粒子交换。
It was found that there exists a secondary flow region nearby the wall.
室内没有书，没有画，两个墙洞便是他们的床，看上去就像轮船上倚壁而设的地铺一样。
There were no books or pictures, and instead of beds there were bunks, like on board ship, built into the wall.
她们把她的床放在了公寓的其他地方，并把壁凹变成了一个壁橱。
They put her bed elsewhere in the apartment and converted the alcove into a closet.
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