The Iranian capital Tehran is at the best of times - one of the most polluted cities on earth.

即使在环境状况最好的时候，伊朗首都德黑兰仍然是世界上污染程度最严重的城市之一。

youdao

The Iranian capital Tehran is at the best of times - one of the most polluted cities on earth.

即使在环境状况最好的时候，伊朗首都德黑兰仍然是世界上污染程度最严重的城市之一。

youdao