cleaned air

• 干净空气

cleaned air的用法和样例：

例句

1. Plentiful supplies of clean air, fresh water, and fertile soil are regenerated endlessly and spontaneously by geological and biological cycles.
   干净空气，淡水和肥沃的土壤的许多补给不断地而且自然地被地质学的和生物学周期再产生。