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.
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's because they're in the with the ID value container, which is given a position of relative.
这是因为它们位于id值为container的中，而container的位置设置为relative。
This ensures that the exact value of the relative position is set only once, and you can later define a spacing between the two.
这确保了相对位置的精确值设置一次，以后你可以定义一个两者之间的间距。
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