同学你好，该知识点来自沪江网校《BEC商务英语初、中级连读【随到随学班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学好，
switch off意为：关掉，关上(电灯、电子设备等) ，英文释义为：If you switch off a light or other electrical device, you stop it working by operating a switch.
如：She switched off the coffee-machine. 她关掉了咖啡机。
shut down指的是： (使)(工厂、公司等)关闭,歇业，停业 ，英文释义为：If a factory or business shuts down or if someone shuts it down, work there stops or it no longer trades as a business.
如：Smaller contractors had been forced to shut down. 规模较小的承包商已被迫歇业。
祝学习愉快~