my uncle began to learn horse horse riding at the age of four的同义句 my uncle began to learn riding --- he ----

my uncle began to learn horse riding when he was fourwhen sb was +年龄 的意思是在某人几岁时,它的同义句是at the age of+数字(意思是在几岁时）所以when sb was +年龄可以和at the age of互相转换,所以以后如果...