hand dynamo

例句：

1. 1. The hand dynamo is essential for lighting up the room during a power outage.
   在停电期间，手摇发电机对于照明房间至关重要。
2. 2.The old man was using his hand dynamo to start a fire in the fireplace.
   那位老人正在用手摇发电机点燃壁炉里的火。
3. 3. The engineer used a hand dynamo to power up the remote control system.
   工程师使用手摇发电机为遥控系统供电。