jump是什麼意思解釋一下

　　She hadn't heard his approach and jumped as the door opened.

　　她沒有聽見他走近的聲音，所以門開時嚇了一跳。

　　Do you want a ride? Jump in.

　　你想搭車嗎？快上來吧。

　　The gentle touch of his hand on her shoulder made her jump.

　　他的'手輕輕地觸了一下她肩膀便使她跳了起來。

　　With his last jump he equalled the world record.

　　他的最後一跳平了世界紀錄。

　　The negotiations took a jump forward yesterday.

　　談判昨天取得進展。