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

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