請隨手關門。

Please close the door behind you.

Please shut the door behind you.

Source: Tatoeba

Sentence Composition

=1 請 qǐng
  1. to ask
  2. to invite
  3. please (do sth)
  4. to treat (to a meal etc)
  5. to request
=1 請 qīng only used in 請室／请室 (qīngshì)
2 隨手 suíshǒu
  1. conveniently
  2. without extra trouble
  3. while doing it
  4. in passing
3 關門 guānmén
  1. to close a door
  2. to lock a door
  3. (of a shop etc) to close (for the night or permanently)