shut off为切断，关掉。
turn off为关掉，关闭拐弯，使转变方向使失去兴趣。
shut off
释义：切断关掉
短语：
Power Shut-off 电源关断 完全电源关断 到完全电源关断 电源关闭
shut-off block 开关组 关闭部件英语
shut-off nozzles 停闭喷咀
例句：
They pulled over and shut off the engine.他们把车停到路边并关掉了发动机。
Billy tends to keep things to himself more and shut himself off.比利更加倾向于把事情藏在心里，不与他人来往。
turn off
释义：关掉，关闭拐弯，使转变方向使失去兴趣
短语：
turn-off pulse 熄火脉冲
Turn ECM Off 雷达干扰关闭
turn-off arm [电] 关断臂
例句：
The truck turned off the main road， and went along the gravelly track which led to the farm.卡车离开主路，沿着通向农场的碎石路行驶。
The light's a bit too harsh. You can turn it off.那灯光有点太刺眼。你可以关掉它。
What turns teenagers off science?
是什么使青少年们对科学失去了兴趣
