这两个函数均按照深度优先的顺序遍历树，但两者的差异在于先访问一个节点还是先访问其子节点。
Both functions walk the tree in depth-first order but they differ in whether a node is visited before or after its children.
这张照片中（其构图更为复杂）的绝大多数拍摄元素均按照这一法则排列，当然这不是指科学意义上的精确位置。
Most of the elements of this photo (a more complex composition) are generally lined up according to the rule, but not with scientific precision.
其数值均按相应质量比混合法调制，使用经过检定机构检定的标准气体。
All JCSS gases are assigned their values using gravimetric standard gases analyzed by the government agency.
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