The meaning of this sentence is: only after experiencing a calamity can true brotherhood be revealed. If two people have a grudge, when they meet each other, they can drink a meal, laugh a little, and pat their shoulders, and the grudge will be resolved.

From:

Lu Xun <Title Sanyi Tower> (1933)

--Sanyi Tower, China, Shanghai Zhabei Sanyi Lane, the remains of the turtledove buried bones of the tower also, in Japan, farmers **** built it.

Running thunder and flying flames annihilate the son of man, defeated wells and ruins of the wall left hungry turtledoves.

Occasionally, the big heart from the fire house, the end of the tower to read Yingzhou.

The bird of prey is still dreaming of a stone, and the fighter is determined to fight against the flow.

This is the first time I've ever seen a brother in the world, and I'm sure he'll be happy to see me.