And Hangzhou is often foggy in the morning before sunrise, emissions, and exhaust gas collected under the tree, so if you do exercise there, you are breathing those polluted air.

而且杭州雾天比较多，没出太阳前，废气、尾气都被压在树下面，这时去树下锻炼吸的都是废气。

youdao

And Hangzhou is often foggy in the morning before sunrise, emissions, and exhaust gas collected under the tree, so if you do exercise there, you are breathing those polluted air.

而且杭州雾天比较多，没出太阳前，废气、尾气都被压在树下面，这时去树下锻炼吸的都是废气。

youdao