No wonder it didn't rain. They opened the umbrella. They didn't want to protect the rain, but wanted to use the umbrella as a sail to let the boat go forward.
2. Appreciate:
The poet saw two children on a small fishing boat. They put away bamboo poles, stopped paddles and opened umbrellas. The poet realized that the reason why the two children opened umbrellas when it didn't rain was not to shelter from the rain, but to use the wind to let the boat go forward.