magnetics的用法和样例：
例句
- North magnetic poles repel (each other).
磁北极与磁北极互相排斥。 - The block becomes magnetic when the current is switched on.
通电时线圈即具磁性。 - The loop becomes magnetic when the current is switched on.
通电时线圈就会有磁性。 - She has a magnetic personality.
她具有极具吸引力的性格。
