dynamo
/ˈdaɪnəməʊ/noun
(pl. -os)
1- chiefly Brit. a machine for converting mechanical energy into electrical energy, typically by means of rotating coils of copper wire in a magnetic field〈主英〉发电机。
1.1
- informal an extremely energetic person〈非正式〉精力充沛的人：
she was a dynamo in London politics.
她在伦敦政界非常活跃。
词源
late 19th cent.: abbreviation of dynamo-electric machine, from Greek dunamis 'power'.