jumped是什么意思?

　　She jumped down from the chair.

　　她从椅子上跳了下来。

　　She jumped down off the chair.

　　她跳下椅子。

　　He jumped up from his chair.

　　他从椅子上跳起来。

　　They jumped over the stream.

　　他们跳过了小溪。

　　The film jumped during projection.

　　电影放映时跳了片。