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。