快速答案
fechar 关闭开口或入口；desligar 让设备或系统停止运行。
可靠的方法是先判断这个词在句子里的功能，再翻译。
每个词的作用
fechar
to close
Use fechar for doors, windows, containers, files, accounts, and businesses.
desligar
to switch off
Use desligar for devices, lights, machines, and systems that stop operating.
如何选择
- fechar: Choose fechar if the sentence points to doors, windows, containers, files, accounts, and businesses.
- desligar: Choose desligar if the sentence points to devices, lights, machines, and systems that stop operating.
例句
Feche a porta, por favor.
Close the door, please.
Desligue a televisão.
Turn off the television.
常见误区
Closing an app or file is fechar. Turning off the phone itself is desligar.
放到语境中练习
从你的真实生活中选一个句子，写两遍：一次用 fechar，一次用 desligar。如果两个版本都可以，说明意思怎样变化。