为什么有older sister的说法,还有elder sister的说法?

为什么有older sister的说法,还有elder sister的说法? my ( )sister is two years ( )than I.A.older elder.B.elder older.C.older.older.D.elder elder 为什么 英语语法：为什么有more and more old 或more and more big 的说法不是应该older and older吗?另外：年龄越来越大该怎么翻译呢.是用old还是big形容年龄大? My older sister是什么意思 关于older.old.elder1.是my older sister 还是 my elder sister?2.是is older than还是is elder than?3.我看网上有写:家人亲属关系之间的比较级是用elder的那普通的比较级就用older了吗还是说全部都是固定的older th She s12.she sthe older sister的翻译 My older sister=My elder sister?两者都等于 我的 是姐姐? my beautiful older sister中文 my beautiful older sister翻页 my sister is older than (I am by) three years为什么 一道英语选择题,My____sister who works in the bankmy ( ) sister who works in the bank is two years ( ) than i.a younger; older b older ;elder c.elder ;elder d,elder ;older应该选哪个?为什么 其他的不选又是怎么错了?求详解希 My older sister help me do my homework的同义句 为什么有饱暖思淫欲的说法? 为什么有竹报平安的说法? old比较级为什么不是older,elder与older有区别吗? you are not older sister must vagetable Venus is the older sister翻译 看和改我的英语演讲稿的语法是否有错误!急快!以下是稿（我是初中的）：A.B.Good morning,everyone!Today we will tell you about our dream.A.I’m older two minutes than my sister ．So I’m older sister B.I am younger two mi