这可以是任意对象，甚至可以具有一个深度嵌套的结构。
This can be any object, even one with a deep nested structure.
结构可以嵌套，但这一示例包含了每一个基本有效性概念。
Structures can nest, but every basic validity concept is included in the example.
请注意，是如何根据元素嵌套来缩进结构的。
Note how the structure is indented based on element nesting.
主要概念是可嵌套定义分解结构的活动。
The main concept is the activity that can be nested to define breakdown structures.
这里有个嵌套结构的示例。
个或更多表嵌套在一个树结构中。
在这个元素中，任何种类的活动(简单的或结构化的)可以被嵌套。
Within such an element any kind of activity (simple or structured) may be nested.
可以在一种控制结构中嵌套另一种控制结构。
You can nest one kind of control structure within another kind.
本文以动词词组嵌套结构为底层结构来证明它应用的有效性。
This research is taking this structure as the derivation basis to confirm its usefulness.
本文以动词词组嵌套结构为底层结构来证明它应用的有效性。
This research is taking this structure as the derivation basis to confirm its usefulness.
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