As each element is defined, you need to identify which parent elements it can be in and which child elements (if any) it can contain.
在定义每个元素时，需要确定它可以包含在哪些父元素中，以及包含哪些(如果有的话)子元素。
Medications like stimulants for attention deficit and hyperactivity are both over-prescribed and under-prescribed because we're not good at finding out which child needs them.
如对注意力缺失或多动症用刺激剂等药物治疗，不是剂量过大就是剂量过少，这是因为我们并不善于判断哪一个孩子需要他们。
They are not about which child-rearing book is most popular, they are about which child-rearing book we should follow.
不是在讨论哪一本有关抚养幼儿的书最流行，而是说我们应该按哪一本书中所说的去做。
They are not about which child-rearing book is most popular, they are about which child-rearing book we should follow.
不是在讨论哪一本有关抚养幼儿的书最流行，而是说我们应该按哪一本书中所说的去做。
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