at the age of 的意思以及用法

at the age of 的意思以及用法
AT THE AGE OF的意思以及用法,还有BE AIR的意思以及用法.

(1) at the age of = 在xxx岁时:
(a) At the age of 20,we don't care what the world thinks of us; at 30,we worry about what it is thinking of us; at 40,we discover that it wasn't thinking of us at all.
(b) To rent a car at age 20 requires a credit card and paying additional fees.
(c) At age 20,Yuja Wang has already established herself as a famous pianist.
(2) be fair = 公平;
(a) We must be fair to the students 我们必须公平对待学生
(b) The other thing that's important to remember is that there is no actual good
reason for either parties or the press to be fair to candidates.