A small oversight or neglected minor problem can lead to a major catastrophe.
小王没有及时修复屋顶上的一小块破损，结果到了雨季，整个屋顶都漏水了，真是猿穴坏山啊。
Little Wang didn't fix a small damaged part of the roof in time, and as a result, the entire roof leaked during the rainy season, truly exemplifying how a small oversight can lead to great disaster.
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