cross magnetic field

例句：

1. 1. The car crossed the river on abridge.
   汽车在一座桥上穿过了河。
2. 2. She crossed the street to get tothe store.
   她穿过街道去商店。
3. 3. Thehikers crossed the mountain range in twodays.
   徒步旅行者两天内穿越了山脉。