物竞天择确保只有最适应环境的物种才得以生存下来，把基因传递给下一代。
Natural selection ensures only the fittest survive to pass their genes on to the next generation.
确保只有一行是父类方法调用。
Make sure that there is only one line that is a super method invocation.
确保只有您可以信任的程序 才能添加或者删除锁文件！
Make sure that only programs you can trust can add and remove these lock files.
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