英文中,年龄前加in,at1)表示“在某人几十多岁”,用“in ones +基数词复数形式”例如:He is in his seventies.(从70岁到79岁之间)2) at the age of例如,:Later,at 7 years old,I went to a primary school near my home.后来我七岁的时候去了附近的一所小学 was orphaned at 7 years old.雷锋7岁成为孤儿.