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1·The story was introduced apropos of nothing.

这一报道是凭空编造来的。

2·Suddenly, apropos of nothing at all, he begins to talk – disconnectedly at first, and then more and more clearly, emphatically, resolutely.

突然他没头没脑他说开了—起初有点儿杂乱无章，后来越来越清楚，雄辩、有力。