请教学长们：小弟弟是younger brother还是 little brother谢谢

请教学长们：小弟弟是younger brother还是 little brother谢谢 弟弟是younger brother还是young brother? 他的小弟弟 his little brother 这里his是所有格吗?为什么不能用he little brother? young children是young 而younger brother是younger.why? little.brother! my younger brother younger than me. 是old brother,older brother还是elder brother? 我小弟弟刚出生时只有3公斤重. __________________my little brother ________ My little brother is three years than I A:smaller B younger My dear little brother： My little brother can_______. You twin brother什么younger than you?