13.on the dot 准时,正点 14.once and for all 最后一次,干脆 15.out of earshot 不在听力所及范围 16.out of this world 非常好 17.play by ear 随机应变,视情形而定 18.ring a bell 令人想起某件事,听起来耳熟 19.share a common outlook 有共同的观点 20.six of on...