For each top-level feature, or facet, there is a sub-tree of possible values.

对于每个顶级特性或方面，都有一个可能值组成的子树。

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The key of a node is always smaller than the keys of the nodes in its right sub-tree.

节点的键始终小于它右边的子树中的节点的键。

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If it is applied to some package in the model, then it is visible only in that package's sub-tree.

如果它被应用到模型的一些包中，那么它只能在这些包中看到。

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During her time in Ghana, Warren stumbled upon women who collect the fallen nuts from the shea tree, indigenous to sub-Saharan Africa.

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Ron Morano, a spokesman for Jersey Central Power and Light, where essentially all of its 1.1 million customers lost power, said the company was looking at ideas that include putting some sub stations underground and more aggressive tree-trimming.

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