Why are the Buddhist temples in ancient China all single-storey (odd number) instead of even number?

The first reason is that the odd number is positive and the even number is negative. The second reason is that most temples are built in the form of ancient buildings, so most of them are single-storey. A single Buddhist temple often has multiple floors, such as pavilions and bedrooms, and there are also two floors. Single Buddhist temples are mostly single-storey, because most Buddhist temples are in the form of treasure halls. Ancient temples and pavilions were single-storey, while buildings and pavilions were multi-storey.