“绿肺”常见的英文表达是 “green lung”，它形象地比喻了像肺一样为城市或区域提供新鲜空气、净化环境的绿色植被区域，比如大型公园、森林等。
例句：
This large forest acts as the green lung of the city, purifying the air and providing a haven for wildlife.（这片大森林是这座城市的“绿肺”，净化着空气，并为野生动物提供了栖息地。）
The newly built ecological park has become an important green lung in the suburbs.（新建的生态公园已成为郊区一处重要的“绿肺”。）