If you are unable to figure out what's wrong with a command, and it looks like it should work, it's quite possible that one of the files already created by make was created incorrectly.
如果不能定位命令中哪儿出现了问题，并且它看起来应该正常工作，那么很可能是make前面创建的某个文件没有被正确创建。
It is surprising that gales are unable to blow magpie nests out of the trees, but the billboards people make with new materials fall down in strong winds and hit cars on the street.
奇怪的是，喜鹊就地取材搭的窝八九级风也吹不掉，而我们用新材料做的广告牌遇七八级风就开始砸车。这究竟是为什么？
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