longadj.长的；冗长的；久的；长音的adv.长期地；久地；用于名词后强调某事发生在某整段时间v.渴望n.长时间；长音节；囤积商品者long mark长传号

1. A bad leg ruled him off for long distance running.
   他的腿痛使他不能参加长跑。
2. Every winter, he does long-distance running.
   每到冬季他都参加长跑。