没能升职我很失望——不过话说回来，我也没有申请很多其他职位。

I was disappointed not to get the promotion - ___but ___then ___again, I hadn't applied for many other roles.

住在市中心非常方便，但话又说回来，噪音和生活成本可能让人难以承受。

Living in the city centre is incredibly convenient, ___but ___then ___again, the noise and cost can be overwhelming.

他声称项目是成功的，但另一方面，他往往忽略了严重的预算超支问题。

He claims the project was a success, ___but ___then ___again, he tends to overlook the significant budget overruns.