have its existence rationality
有其存在的合理性
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Can't remember which famous person once said such a sentence: the existence of a thing, must have its rationality and necessity. Cleaning liquid is also such a reason.
记不清哪位名人曾经说过这么一句话：一件事物的存在，必然有它的合理性和必要性。清洁液也是这样的道理。
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