The Rope class is designed to be immutable, meaning that mutator functions never modify the original Rope instance, but, rather, return a modified copy.
Rope类被设计成不可修改，这意味着mutator函数永远不会修改原来的Rope实例，而是返回一个修改后的副本。
Move a pulley set enlarge to return to rope round the route of travel satisfies a steel wire rope to use early elongation of demand.
动滑轮组放大回绳轮行程满足钢丝绳使用初期伸长的需要。
She said that she would voluntarily let go of the rope, because as woman she was used to giving up everything for her husband and kids, and for men in general, without ever getting anything in return.
她说，她愿自动跳下去，因为她习惯了什么都能放弃，为了她的丈夫、她的孩子，还有天下所有的男人，不图任何回报。 她的话音刚落，所有的男人都为她鼓起掌来。
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