Don answered the door 21 spryly in his wheelchair and invited me to sit at a couch surrounded by cardboard moving boxes.

坐着轮椅的唐敏捷地应声开门，请我坐在长沙发上，周围已经围满了活动纸板箱。

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But at the age of 79 he spryly announced that he would take it up again: still the nearest thing humans have to the carefree flight of birds.

ECONOMIST: Paul MacCready