He has been writing to us off and on for several years.

他断断续续地给我们写信已经有好几年了。

youdao

She's had headaches off and on for the last several years.

她以前曾有过这样的这种头痛吗？

youdao

The two have been on and off for several years.

两个人的关系分分合合持续了好多年。

youdao

The two have been on and off for several years.

两个人的关系分分合合持续了好多年。

youdao