13 lose one's train of 忘记
14 meet each other half way 相互妥协，让步
15 on the dot 准时；正点
16 once and for all 最后一次；干脆
17 out of earshot 不在听力所及范围
18 out of this world 非常好
19 play by ear 随机应变，视情形而定
20 ring a bell 令人想起某件事；听起来耳熟
