定義:to clatter, i.e., slap (the hands together), clang (an instrument); by analogy, to drive (a nail or tent-pin, a dart, etc.); by implication, to become bondsman by handclasping)
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