jog是什么意思解釋一下

　　例句：

　　I began by jogging in the park and worked up to running five miles a day.

　　我開始在公園里慢跑，后來逐漸增加到一天跑五英里。

　　It takes a lot of self-discipline to go jogging in winter.

　　在冬天跑步是需要很大的自律力的。

　　Someone jogged her elbow, making her spill her coffee.

　　有人不小心輕輕碰了一下她的胳膊肘兒，把咖啡弄灑了。

　　They set off at a jog up one street and down another

　　他們開始沿著一條又一條的街道慢跑。