his ad-lib comments showed poor judgment; an extemporaneous piano recital; an extemporary lecture; an extempore skit; offhand excuses; trying to sound offhanded and reassuring; an off-the-cuff toast; a few unrehearsed comments.

• 他的即席评论显得缺乏判断力；临时的钢琴独奏会；即席演讲；即席幽默；临时借口；试图听起来即席又可靠；即席祝酒；一些临时评论。