Translation of "underside" into Chinese

In at least two instances and possibly all three, it appears that the bombs were attached to the undersides of the vehicles by magnets.

看来至少在2起案件中,可能在所有3起案件中,炸弹都是用磁铁吸在车辆底部。

Each container should be lifted and tilted and the underside examined for possible physical evidence.

对每一容器,均应抬举和倾斜,审视其底部,查找可能的实物证据。