show-off (also showoff)

• 1. 

  N-COUNT If you say that someone is a show-off, you are criticizing them for trying to impress people by showing in a very obvious way what they can do or what they own. 爱卖弄的人 [非正式]

  例：

  Many jet ski riders are big show-offs who stick around populated areas so everyone can see their turns and manoeuvres.

  许多驾喷气式滑艇者都是极爱卖弄的人，他们总是出现在人多的地方，好让大家都能看到他们的翻转和各种熟练动作。