这就是 z 值的实际价值：您可以按照任何顺序来创建对象，并可以通过调整每个对象的 z 值来调整彼此之间的相对位置。
That is the real value of the z dimension: You can create objects in any order you choose and position them relative to each other by adjusting the z value on each object.
然而，另外一种与之相对立的看法认为，这两个人就像一对处于离婚边缘的夫妇：他们很少有一致的看法，彼此之间的信任更是少得可怜。
A rival perception, however, suggests that they are more like a couple on the verge of divorce: they agree on little, and trust each other even less.
机构被定义为：“是由刚体或者有承载能力的物体连接而形成的组合体，它们在运动时彼此之间应该具有确定的相对运动。”
A mechanism has been defined as "a combination of rigid or resistant bodies so formed and connected that they move upon each other with definite relative motion."
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