"Fresh air" 是空气是新鲜的用英语表达。这个短语来源于英语中新鲜的意思，air表示空气。
例句：
"I always feel refreshed after spending some time outdoors in the fresh air." (我总是在新鲜的空气中户外度过一段时间后感到精神焕发。)
"The mountains offer a welcome change from the city's polluted air, with their cool and fresh air." (山上的空气是城市污染空气的欢迎更换，它们有凉爽和新鲜的空气。)
"He opened the window to let in some fresh air." (他打开窗户让新鲜空气进来)