没有必要对每个元素应用该谓词来查看它是否是真，因为处理可能在第三个节点后停止。
It is not necessary to apply this predicate explicitly to every element to see if it is true, since processing can stop after the third node.
组合特定元素来创造一幅独一无二的图像以让大多数经验丰富的慧眼信以为真，这要求一整套极具创造力的技艺。
Combining certain elements to create a unique image, that can convince even the most experienced set of eyes, requires a very creative set of skills.
如果该条件为真，那么将执行元素中的命令。
If this condition is true, then the command in the element will be executed.
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