two hundred?要不要加s?

two hundred?要不要加s? two hundred 后要不要加s啊? two hundred old people 的people要不要加s 为什么 two hundred hundred不用加s? The One Hundred Day Day 要不要加s的? two pairs of gloves glove要不要加S? 为什么two-year-old的year不加S而two-hundred-words的word要加S 265 is two hundred and sixty-five.为什么hundred后面不用加s 3600kg用英语怎么读?three thousand,six hundred 要不要在后面加s?thousand和hu make two rooms reservation(s)要不加s many hundred的hundred要加s吗 there are hundred of students on the piayground ,hundred要不要加