当我提及水平面时，并不是指整个平面。
When I say a horizontal plane, it doesn't have to be the entire horizontal plane.
我们已经学过一个公式，它是关于水平面的，或者某些平行于yz平面或xz平面的平面。
Well, we've seen a formula, for example, for a horizontal plane, or for something that's parallel to the yz plane or the xz plane.
人们根据解剖方位，设想有多个平面贯穿人体，并由此作出多种描述，即正中面、矢状面、冠状面和水平面。
Many descriptions are made using imaginary planes passing through the body in the anatomical position. There are median, sagittal, coronal and horizontal planes.
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