副詞 on air:

1. very happily

1. After hearing the good news, Charles walked on air.
   聽到這個好消息，查爾斯喜氣洋洋。
2. After he heard the news he trod on air.
   聽了這一消息后，他得意洋洋。
3. Malcolm has been walking on air since he was offered that job he has been trying so hard for.
   自馬爾科姆得到那份他一直非常想得到工作后，他一直洋洋得意。
4. He waltzed me round so delicately I felt as if I was floating on air.
   他非常輕快地帶著我跳華爾茲舞，我感到好像在空中飄蕩著。