one-thirds与one-third哪个对?

one-thirds与one-third哪个对? one third和one thirds有什么区别 "one third" or "one-third" ? Two-thirds 后用is还是are,那one third呢? one third +n +be two thirds+n+be 中的be动词与名词的可不可数 单复数有没有关系 a third与one third 有什么异同 four-thirds对 还是four-third one third of people做主语时,谓语用单数还是复数?two thirds of people做主语时,谓 one-third of z one third of one ...another...a third...还是the third anyone of them 与any one of them 哪个对?