jumped是什么意思?

　　She jumped down from the chair.

　　她從椅子上跳了下來。

　　She jumped down off the chair.

　　她跳下椅子。

　　He jumped up from his chair.

　　他從椅子上跳起來。

　　They jumped over the stream.

　　他們跳過了小溪。

　　The film jumped during projection.

　　電影放映時跳了片。