field loop jumper

例句：

1. 1.This field loop jumper is used to measure the distance between two points on a field.
   这个田野跳线器用于测量田野上两点之间的距离。
2. 2.The field loop jumper was used to detect the location of a buried object.
   田野跳线器被用来探测埋藏物体的位置。
3. 3. The field loop jumper was used to monitor the movement of animals in the field.
   田野跳线器被用来监控田野中动物的活动。