Two small figures were beating against the rock; the girl had fainted and lay on the boy's arm.
两个小身影在撞击岩石；女孩晕倒了，躺在男孩的胳膊上。
2
She was led by the arm to a small room at the far end of the corridor.
她被抓着胳膊带到走廊另一头的一个小屋里。
《柯林斯英汉双解大词典》
3
Matrix codes on the backs of plates keep track of how long a sushi portion has been circulating on conveyor belts; a small robotic arm disposes of any that have been out too long.