英语翻译大多数吸烟者都意识到吸烟的危害.因为受伤他不得不退出赛跑.她不向我们打声招呼就走了,这是非常不礼貌的.当她的邻居需要帮助时,她从来都不会不理他们.

Most smokers were aware of the harmfulness of smoking.
He had to drop out of the race because of injury.
It is very impolite for her to leave without saying a word to us.
When her neighbors need help,she never ignores them.
希望能够帮到楼主