到底是the apple of one's eyes还是the apple of one's eye?也就是说eye到底是单数还是复数?

到底是the apple of one's eyes还是the apple of one's eye?也就是说eye到底是单数还是复数? 关于an apple a day,keeps the doctor away到底是an apple a day an apple one dayone apple a day还是one apple one day apple of one's eye 中apple是单数还是复数我看见有的固定搭配是the apple of one's eye ,有的是 an apple of one's eye ,有什么区别吗 这到底是you are an apple of my eyes还是you are an apple in my eyes还是you are the apple in my eyes其实我的问题就是 an apple和the apple ,in和of Apple of one's Apple of one's the apple of one‘s eye 和 the apple in one’s eyes ,这两个是有一个是错的吗? the apple of one's eye 是出自《圣经》哪里啊? i put one apple of each type on the table,为什么是of each type?应是each type 而且one apple而且 one apple是怎么搞的?应该是复数? 一个苹果的价格是5元,是用for还是用of The price of one apple is ￥1. the apple of one's eye 的问题the apple of one's eye指瞳孔,珍爱物,宝贝,掌上明珠.所以想问,是不是多用于亲人间,比如女儿是爸爸的掌上明珠?恋人间常用吗? the apple of their the apple of her the apple of my the apple of their The apple in one's The boy ate one half of the apple and leThe boy ate one half of the apple and left another half for his sister（改错） One was the apple eaten by Adam in the Bible;one was the apple falling on the head of Newton;的翻译