in the age of by the age of at the age of的区别in the age ofby the age ofat the age of的区别
问题描述：
in the age of by the age of at the age of的区别
in the age of
by the age of
at the age of的区别
答
1、在....年代
2. 在几岁前
3.在几岁时
答
in the age of 在.的时代
by the age of 到.的年龄
at the age of在.岁时