Contact with the arm的意思|示意

When the auto enters the highway system, a retractable arm will drop from the auto and make contact with a rail, which is similar to those powering subway trains electrically.

当汽车进入高速公路系统时，一只可伸缩的手臂将从汽车上落下，与轨道接触，这类似于为地铁列车供电的轨道。

If the reaction of the person becomes emotional, then it is possible to make contact with them, touching them gently on the arm or shoulder.

如果人的反应变为情绪上的，那你就可以接触他们，轻轻碰触他们的手臂和肩膀。