un·pol·lut·ed
adjective/ˌʌnpəˈluːtɪd/
/ˌʌnpəˈluːtɪd/
- that has not been polluted (= made dirty by harmful substances)
未被污染的；干净的 - the unpolluted air of the mountains
山上未受污染的空气 - Otters need secluded, unpolluted stretches of river with plenty of fish.
水獭需要僻静、未受污染且有大量鱼类的河流。 - The air was fresh and unpolluted.
空气清新，没有受到污染。
- the unpolluted air of the mountains