B1. to leave a place without taking someone or something with you. 丢下，撇下，落下. We left in a hurry and I must have left my …
2、behind表示“在……后面”。如： A high building stands behind the village. 村子后面有一高层建筑。 3、around表示“在……周围，围绕”。 …
(1) fall [drop] behind 落在后面。如： I’ve fallen behind in work. 我工作落后了。 Some students dropped behind in their studies. …
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