嗨，請保持安靜。

Hey guys, please be quiet.

Source: Tatoeba

Sentence Composition

1 嗨 hāi
  1. oh alas
  2. hey!
  3. hi! (loanword)
  4. a high (natural or drug-induced) (loanword)
=2 請 qǐng
  1. to ask
  2. to invite
  3. please (do sth)
  4. to treat (to a meal etc)
  5. to request
=2 請 qīng only used in 請室／请室 (qīngshì)
3 保持 bǎochí
  1. to keep
  2. to maintain
  3. to hold
  4. to preserve
4 安靜 ānjìng
  1. quiet
  2. peaceful
  3. calm