where ashes take the forms of houses and chimneys and rising smoke and, finally, with a transcendent effort, of men who move dimly and already crumbling through the powdery air.
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where ashes take the forms of men who move dimly through the powdery air。 Those men are already crumbling。
把“already crumbling” 理解成為省略的定語從句來修飾前麵的“men” ， 也就是： and men who already crumbling.
Those men are already crumbling (two possible interpretations: one is that those men themselves are, like ashes, decaying; or those men are like fallen bits of ashes if you look at them from distance.)
Jus my two cents.
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