Earthen walls and flat roofs are the traditional form of residential houses in the south

Zhejiang is a subtropical monsoon climate, annual precipitation, the rainy season is long, the roof slope is large, conducive to drainage; Gansu Province, deep inland, warm and humid air currents are difficult to reach, belonging to the temperate continental climate, annual precipitation is low, the climate is arid, the traditional dwellings are mostly flat roofed houses with earth walls.

The answer is: Zhejiang annual precipitation, long rainy season, roof slope, good for drainage. Gansu annual precipitation is low, the climate is arid, the traditional houses are mostly earth walls and flat roofs.

The answer is: Zhejiang has a long rainy season.