Traditional Culture Encyclopedia - Weather inquiry - What's the role of the first paragraph of the excerpt from Shark in describing the sultry weather?

What's the role of the first paragraph of the excerpt from Shark in describing the sultry weather?

The functions are as follows:

1. It has promoted the development of the story. It is precisely because of the sultry weather that the people on board, including two children, went swimming in the sea, and only when they met a dangerous shark in the process of swimming, did an old gunner kill the shark with a gun and save the lives of two children. The story is ups and downs and exciting.

2. Set off the characters and the harsh environment, which set off the sailors' strong, intelligent and patriotic feelings of defending the country.