每年是用every year 还是every years 这两者有什么区别?

每年是用every year 还是every years 这两者有什么区别? every year 与every years every two years 和every other year的区别? every third year与every three years的区别 是hello everyone还是hello every one ,有什么区别 every 2 year?every 2 years? every four years 与 every third year every fo 请问 每19年 应翻译成 every 19-year 还是 every 19-years? very four years every other year every few years It has rained every day this week.为什么这里用现在完成时不用一般现在时.两者有什么区别 in recently years和in recent years这两者有什么区别?还是哪个有错?（表意在近几年） 喀斯特是地形还是地貌?这两者有什么区别?