aff and on

• 断断续续； 间歇地

aff and on的用法和样例：

例句

1. He had been work here,on and off,for two years.
   他在这儿断断续续工作了两年。
2. I began to write intermittently and spasmodically.
   我开始断断续续地写了起来。
3. He had to work all day and every day to earn a living.
   为了谋生，他只有永不间歇地工作。
4. A numbers station is a government operated radio station broadcasting intermittently on the short-band frequencies.
   电台是政府操作的无线电发射站，间歇地发射短波频率。