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What does the Chen Handian Bat Stewardess mean by a cold joke?

There was a mouse who couldn't find a partner. All the other mice laughed at him for being worthless, so he went to other places and finally found a bat, but all the other mice laughed at him. He shook his head and said, the sea! Okay, it's a stewardess!

That means at least he can fly. It's better than a mouse on the ground.