这个 but 其实是一个表示否定意义的关系代词(= who / that…not)。如:
There is no one but knows it. 没有人不知道这件事。
=There is no one who doesn’t know it. 没有人不知道这件事。
又如:
There is no man but has his faults. 人皆有过。
There is no rule but has exceptions.
没有无例外的规定。
There is no tree but bears some fruit. 没有树不结果。
Not a man but had tears in his eyes. 没有人眼中没有眼泪。
There is no man but feels pity for starving children. 没有人不同情那些嗷嗷待哺的孩子。
Surely there isn’t a mother but faces this problem. 肯定的,没有一个母亲不面临这个问题。
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