I have a dream中的：My country'tis of

I have a dream中的：My country'tis of America (My Country Tis Of Thee) 歌词 My country 'tis of thee, sweet land of liberty, of thee I si country 'tis这句话中的'tis是什么意思?是什么用法? Germany ,a country I dream i kind of have a dream? My country'tis of thee这句话怎么不通顺的感觉? 请问这首歌My Country 'Tis Of Thee'的歌名怎么译? Only then will I have a chance of achieving my dream Only then will I have a chance of achieving my dream是什么句型? only then will i have a chance of achieving my dream.为什么will Only then will I have a chance of acheving my dream