1. 有吸引力的事物
    If you say that something is a magnet or is like a magnet, you mean that people are very attracted by it and want to go to it or look at it.

    e.g. Prospect Park, with its vast lake, is a magnet for all health freaks...
           拥有一大片湖区的普罗斯佩克特公园吸引着所有注重健康的人。
    e.g. Lower interest rates are acting like a magnet, dragging consumers back to the shops.
           较低利率像磁铁一样吸引顾客又回到了商店。

2. 磁铁;磁体
    A magnet is a piece of iron or other material which attracts iron towards it.

    e.g. ...a fridge magnet.
           冰箱磁铁