2 sentences

1. 他化名潜入敌后执行任务。

   tā huà​míng qián​rù dí​hòu zhí​xíng rèn​wu.

   He went behind enemy lines to carry out a mission under an alias.

   Source: Dong Chinese Dictionary

2. 这是作者发表小说时用的化名。

   zhè shì zuò​zhě fā​biǎo xiǎo​shuō shí yòng de huà​míng.

   This is the pseudonym the author used when publishing the novel.

   Source: Dong Chinese Dictionary