crossed static electric and magnetic field

例句：

1. 1.The hikers crossed the river on amakeshift raft.
   徒步旅行者用临时筏子横渡了河流。
2. 2. Shecrossed the street to avoid the traffic.
   她横过马路以避免交通。
3. 3. Thecar crossed the finish linefirst.
   汽车首先冲过了终点线。