告诉孩子在离开房间时关掉所有的灯，以节约用电。
Tell the boy to switch off all the lights as he leaves the room in order to save electricity.
此计算器如停止操作8分钟，会自动关掉电源以节约用电。
This calculator is automatically turned off approximately 8 minutes after the last key operation to save the batteries.
出门上班前会检查家里的电如电视，电脑，灯泡等是否都关闭了以节约用电。
Also check all electric such as TV, notebook, bulb whether turned off before we go to work.
应用推荐