《资治通鉴·晋纪·晋纪四》
中书省设在禁苑，禁苑中有凤皇池，因此中书省又称凤皇池。
帝极意声色，遂至成疾。
The Zhongshu Province was located in the Forbidden Garden, and there was a Phoenix Pool in the Forbidden Garden, so the Zhongshu Province was also called the Phoenix Pool.