Living in Guangzhou, I am really helpless about the rainy season. After years of struggle, I finally found a better way to deal with the rainy season. That's a dehumidifier. Home use is cheap and the effect is not so good. My family bought an industrial dehumidifier, which can simply dry my voice.
However, after all, the subject is in the dormitory. I suggest that everyone can chip in to buy a home, which is enough to deal with a dormitory of more than ten square meters. It doesn't matter if the budget is not enough. I also have a good way to deal with it without spending money. It's just that any method can be alleviated before the rainy season, and it can't be completely cured.
Sticking unused old newspapers on the wall can absorb moisture. I used to hang dehumidifying bags in the closet. I think the effect is good, too, but it's still a bit expensive to buy a new dehumidifying bag once a week.
So my last suggestion is, don't open the window, always keep the newspaper dehumidifying bag, and wipe the wall with a dry cloth when it is wet. Buy a dehumidifier together if you can. Someone on the Internet suggested using quicklime to dehumidify, but I don't think so. Lime will heat up when it meets water. I'm afraid it's not safe. I suggest that the theme should use my method.
In fact, there are many dehumidifying tools and dryers on the Internet now, which can dry quilts and clothes. It feels like a good choice. It is suggested that the subjects drink some herbal tea in rainy season, which can get rid of dampness and is not easy to get sick because of moisture. As for the wall, it will be better after all the above treatments are done, but it is best not to stick it on the wall when sleeping.