一定有他道理
There must be a reason
以上为机器翻译结果，长、整句建议使用 人工翻译 。
说孟买是世界垃圾之都一定有他的道理，看到处是疯狂的拥挤。
Mumbai might just be the litter capital of the world, which makes sense, as its insanely overcrowded.
youdao
但是，上帝赐给我们哭的能力，一定有他的道理。
But, since God has give this ability to the human beings, he must have his reasons.
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