摘要： http://www.yywords.com/Article/200806/347.html1.这三个词都用来谈论两者：both意为“(两者)都”，either意为“(两者中)任意一个”，neither意为“(两者)都不”。若要指三者或三者以上，分别用all意为“(三者)都”，any意为“(三者中)任何一个”，none意为“(三者)都不”等。比较：He has two sons; both of them are clever.He has two sons; either of them is clever.He has two sons; neither of them is clever 阅读全文