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"To travel is to live."
注释:怨恨产生于不能容忍他人的小过错,祸患产生于事先没有谋划。
The test of a first-rate intelligence is the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function.
对于系统,翻版的模拟是在控制图中添加一个创建循环的边,而不仅仅是一个附加节点。