The 21st century middle, because the greenhouse effect, the polar melting glaciers, earth many cities submerged.

21世纪中期，由于温室效应，南北极冰川融化，地球上很多城市被淹没。

youdao

The 21st century middle, because the greenhouse effect, the polar melting glaciers, earth many cities submerged.

21世纪中期，由于温室效应，南北极冰川融化，地球上很多城市被淹没。

youdao