on后加什么交通工具

　　She gallantly battled on alone.

　　她單槍匹馬繼續(xù)英勇頑強地戰(zhàn)斗。

　　'Wot's going on?' he shouted.

　　“出了什么事？”他喊道。

　　Smoke appeared on the horizon.

　　地平線上升起了煙霧。