It is said in this park on the roof spotless at all times no matter what, even up autumn leaves never fall.

据说在此园内的房顶上不管什么时候都一尘不染，就连秋天的落叶也从不往上落。

youdao

It is said in this park on the roof spotless at all times no matter what, even up autumn leaves never fall.

据说在此园内的房顶上不管什么时候都一尘不染，就连秋天的落叶也从不往上落。

youdao