Certain metals are attracted to a magnet.

某些金属受的吸引。

She can magnetise a theatre audience.

她能像般吸引剧院观众。

Evolving process of hub dynamo which used in bicycle is presented. The performance of magnetite viz. ferrimagnetism or NdFeB is analyzed. The prospect of marketing is viewed.

摘要介绍自行车上使的花鼓式发电机的演变，析所，即铁氧体或钕铁硼的性能优劣，并进行市场前景展望。