enjoy the fresh air 为什么加the

不一定要加:
As they live in the countryside ,they can enjoy fresh air.
因为他们住在乡下,便可享受新鲜的空气.
He lives in a faraway village,where he can enjoy fresh air and silence.
他住在一个偏远的村庄,在那他可以享受新鲜空气和宁静.
Do not have wanted on the telephone interference,two people enjoy fresh air in the garden together,loosen the mood.
没有电话干扰,两个人一起在花园里享受新鲜空气,放松心情.
只有强调特定地方的空气,才要加,表示一个"限定"
I enjoy the fresh air on our campus.
我喜欢校园里的新鲜空气.
They like to eat outdoors and enjoy the fresh air(there).
他们喜欢在户外吃东西,并且享受新鲜的空气.
They are there to enjoy the fresh air and spring water.
他们到那里去呼吸新鲜空气,享用那里的泉水.