它可以自由地通过，比方说，从细胞外到细胞里，或从膜的一边到另一边。
It can pass freely, let's say, from the outside to the inside of the cell, or from one side to another of a membrane.
纬度同样是从拉丁语而来，是指横向，从一边到另一边的宽度。
Latitude is also from Latin and is related to "lateral" that is from side to side and refers to the width.
我们可从把空气从房间的一边抽到另一边。
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