green lung

基本解释

A 15 x15 metre square, it ensures sunlight for all the rooms and acts as a kind of green lung.
这个院落只有15乘15平方米，但却能为所有房间提供自然光，并充当一个天然的绿肺。
julemei.com
In order to better its environment, Shanghai, China's largest and most populous city is planning to build a forest park spreading out over 300 hectares of land, to be known as the "Super Green Lung".
为了改善环境，中国最大的，人口最密的城市-上海，正在计划建造一座占地300多公顷的森林公园，称为“超级绿肺”。
In order to better its environment, Shanhai, China's largest adn most populous city, is planning to build a forest park spreading out over 300 hectares of land, to be known as the "Super Green Lung".
为了改善环境，中国最大的，人口最密的城市-上海，正在计划建造一座占地300多公顷的森林公园，称为“超级绿肺”。

It was those skills which have turned our once-shiny space station into a steamy green bacteria-funky lung.
NEWYORKER: Lostronaut

an area of parkland within a town or city, considered in terms of the healthier environment it provides