It is easy for teenagers to learn from old age, but difficult to learn. An inch of time is not light. I haven't felt the dream of spring grass in the pond, and the leaves in front of the steps are already autumn (Song Zhuxi)
It's not freezing in the cold, so where does the plum blossom smell come from?
Swallows don't know the height of heaven and earth, and Kanjing doesn't know the breadth of rivers and seas. "。