apropos of preposition
Learner's definition of APROPOS OF
: with regard to (something)）关于；就…而言 -
Apropos of [=concerning] the proposed changes, I think more information is needed.对于所提出的变革，我认为还需要有更多的资料。
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Her comment about the weather was apropos of nothing. [=did not relate to any previous topic]她对天气的评论与议题无关。