手臂的英文怎么写

　　She walked slowly, leaning on her son's arm.

　　她倚靠着她儿子的手臂缓慢行走。

　　He flung out an arm to stop her from falling.

　　他猛伸手臂扶她，她才没有跌倒。

　　He raised his arm to try to deflect the blow.

　　他举起手臂试图挡开这一击。

　　I felt something crawl up my arm.

　　我觉得有个东西顺着手臂往上爬。