turn-off point from main sequence

例句：

1. 1. The engineer found the turn-off point for the circuit.
   工程师找到了电路的关断点。
2. 2. The switch was set to the turn-off point.
   开关被设置到了关断点。
3. 3.The device has a built-in safety feature that will automatically turn off the power when the temperature reaches a certain point.
   该设备内置了安全功能，当温度达到一定点时会自动关闭电源。