My husband, who drives an 18-wheeler, was halfway across a narrow bridge when his truck broke down. Placing hazard markers behind, he returned to his cab to wait for the tow truck.
　　A few moments later a small car drove over his markers and pulled up right behind his truck. My husband jumped out of the cab, ready to give the driver a piece of his mind -- only to discover an elderly woman at the wheel.
　　Before he could say a word, she shouted, "NEED A PUSH?"

             练习句子：Martin刚渡道河中央，这时他发现船上居然有一个洞。"HELP!"
　　　译文：Martin was halfway across the river when he found there was a hole in the
　　　　　　boat.

             "be halfway across ..." "...才走了一半"
             节外生枝："be halfway up/down" "（树、梯子等）刚爬（上/下）到一半。