a few 和 several 的区别

a few 和 several 的区别 a few和several之间的区别是什么? several与a few的区别和用法 several和few的区别是什么? few与several的区别 a number of 与several和only a few的区别 a few,some,several,a lot of的用法和区别 several是不是等于a few和some a few和few.//a little和little的区别 a litter和litter a few和few的区别 a number of 、the number of、little 、 few、 several 的相关用法及区别.谢谢 few days和 several days 有什么区别?