keep out和keep off的區別？

關(自來水、電燈、收音機等)

Please turn off the light.請把燈關了.

shut off

切斷,中斷（供水、供氣）

The electricity shuts off at midnight.

半夜電停了

shut off the hot water by closing a valve.

關上閥門從而阻斷了熱水