强扭的瓜不甜
Traditional (Taiwan):
強扭的瓜不甜
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lit. if you have to use force to break a melon off the vine, it won't taste sweet (because it's only when the melon is ripe that it can be removed with just a slight twist) (idiom)
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fig. if sth is not meant to be, it's no use trying to force it to happen
Character by character
Sources