keep out和keep off的区别？

turn off

关(自来水、电灯、收音机等)

Please turn off the light.请把灯关了.

shut off

切断,中断（供水、供气）

The electricity shuts off at midnight.

半夜电停了

shut off the hot water by closing a valve.

关上阀门从而阻断了热水