Turn the fragment into a method whose name explains the purpose of the method. 将这段代码提取到一个方法中，方法的名字用来解释其意图。
A label assigns a meaningful symbolic name to a snapshot of your code so you can later find that snapshot more easily. 一个标签指派了一个有象征性意义的名字给代码的快照，你可以之后方便的找到这个快照。
