空树(empty tree)是高度平衡二元树 假使T不是空的二元树，TL和TR分别是此二元树的左子树和右子树，若符合下列二个条件，则称T为高度平衡二元树，...
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没有人能肯定地说，这声音是从他的脑袋里发出来的呢，还是从空树里发出来的呢？
Whether the sound came from his head or from the hollow tree, that no one could say with certainty.
空树的汇总是零，其他树的汇总是左树加上Integer的值再加上右树的值。
The sum of an empty tree is zero, and the sum of other trees is the sum of the left tree plus the value of the Integer plus the sum of the right tree.
在地球上的许多地方，生长缓慢的古树森林已被砍伐一空，以供人类使用。
Across much of the planet, forests of slow-growing ancient trees have been cleared for human use.
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