magnet [ˈmægnət]

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n.有强大吸引力的人或物；磁铁，磁体

an object that is able both to attract iron and steel objects and also push them away

He picked all the pins up with a magnet. 他用磁铁捡起了所有的大头针。
Dalian is a magnet for tourists. 大连是吸引游客的地方。