N-UNCOUNT [oft theNOUN]户外空气;(尤指未受污染的)新鲜空气 You can describe the air outside as fresh air, especially when you mean that it is good for you because it does not contain dirt or dangerous substances. 户外空气;(尤指未受污染的)新鲜空气
'Let's take the baby outside,' I suggested. 'We all need some fresh air.'