1.PHRASAL VERB 短语动词 捧腹大笑;笑得前仰后合 If you say that people are falling about, you mean that they are laughing a lot about something.

  【语法信息】：V P

  【语法信息】：V P -ing

  【语法信息】：Also V P with n

  【语域标签】：BRIT 英

  【STYLE标签】：INFORMAL 非正式