Snails and the weather, from which phenomena does the author find that snails can predict the weather?

The wind is warm, wet, dry and cold; Frontal cloud and rain belt; Air pressure; Wind direction 3. "Generally speaking" means that the northeast wind began to rain for a long time and with great intensity, but this situation is not absolute, which reflects the accuracy and rigor of scientific and technological language. It is suitable for traveling, because the more northwest the wind direction is, the stronger the wind is, and the faster the weather will clear up. 5. Example 1: After the rain, the east wind blows and the rain will not stop. Ex. 2: The northwest wind often blows, and it's sunny today.