The environment protection in Beijing really made a big progress, it was our first time to see so blue sky in Beijing.

北京的环保真的有很大进步，这是我们第一次在北京看到蓝天！

youdao

The environment protection in Beijing really made a big progress, it was our first time to see so blue sky in Beijing.

北京的环保真的有很大进步，这是我们第一次在北京看到蓝天！

youdao