The weather is changeable.

The weather is good and bad now. It was sunny in the morning, and it rained in the afternoon. Under the weather, the temperature dropped rapidly. When it isn't, I think I should wear a thin shirt, a jacket outside, a jacket outside or a, uh, windbreaker or something. If you want to wear a sweater, please look at the weather forecast on this mobile phone first. Now the weather forecast is more accurate. I'm afraid of getting sick and having a headache, but I think you'd better bring some warm clothes.