任意两个数都有等差中项吗简介：Tie Dan'er quickly took the chocolate from Slim Monkey's hand, as excited as a little monkey, and instantly slipped out of the door, shouting excitedly towards a large group of children playing outside the house.
Tie Dan'er quickly took the chocolate from Slim Monkey's hand, as excited as a little monkey, and instantly slipped out of the door, shouting excitedly towards a large group of children playing outside the house.
