He was living under an assumed name.

他过着隐姓埋名的生活。

He lived and worked there under an assumed name.

他用化名在那儿居住和工作。

The article here manages for the case with the crisis of the Beihuan group (assumed name).

本文以作者工作的北寰集团（化名）的危机管理为案例。

He couldn't marry under an assumed name, but he had no intention of letting Nora know his surname.

他不会用假名字结婚的，可是，他不打算让劳拉知道他的姓氏。

Article 13 No enterprises may transfer, use under an assumed name, or use forged, work safety licenses.

第十三条企业不得转让、冒用安全生产许可证或者使用伪造的安全生产许可证。