儿子婚前是儿子，女儿终生是女儿。
Nature is the true law.
天行有常，不为尧存，不为桀亡。
Necessity is the mother of invention.
需要是发明的动力。
necessity [ni'sesiti]
n.必要（性）； （迫切）需要； 必需品； 自然规律
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