Several coal cities have already made efforts to turn defunct mines into parks.

几个煤炭城市已经做出了努力，把废弃的矿山变成了公园。

youdao

Several coal cities have already made efforts to turn defunct mines into parks.

几个煤炭城市已经做出了努力，把废弃的矿山变成了公园。

youdao