定義:to nod, i.e., waver; figuratively, to wander, flee, disappear; also (from shaking the head in sympathy), to console, deplore, or (from tossing the head in scorn) taunt
定義:to turn back (hence, away) transitively or intransitively, literally or figuratively (not necessarily with the idea of return to the starting point); generally to retreat; often adverbial, again