还记得吗，一个TOPIC对象的访问权隐式授予对主题树中TOPIC所在位置以及该位置以下的所有主题字符串的访问权。
Remember that access to a topic object implicitly grants access to any topic strings at or below that topic in the topic tree.
未来的林木开采权获得人必须在他们伐倒的每棵树(和剩余的残桩)上打上计算机条码。
Future forestry concessionaires will be obliged to attach a bar code to each tree they fell (and the stumps they come from).
找出权值最小的边，把它和它所到达的顶点放入树的集合中。
Pick the edge with the lowest weight, and add this edge and its destination vertex to the tree.
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