一个英语句子不懂,Many guide dogs that have worked for years know all

一个英语句子不懂,Many guide dogs that have worked for years know all 【英语】改句子 People have kept dogs for milllons of years. Don't you know that I have not smoked for many years?这句话对吗 Dogs have been man's good friends for t______ of years.Many Dogs have been man`s friends for t＿ of years.Many stories to 英语翻译Health experts have warned for many years that cigarette How many years have you worked here?____ten years ago. I know how _____ you have all worked for this test. As we all know,Michael Jackson （）（过着贫穷的生活）for many years whe He;s worked in this factory for many years I worked in northwest China for many years 语法 She worked(as)a teacher for many years.怎么翻译?