What do you mean by white mouth?

Description: 1, a format of the old thread-bound book opening, which is called white opening (different from' black opening').

Baikouzi Baikouzi is a place name in Shaanxi Province, named after surnames and topography. Historical evolution Baikouzi was established in the middle of Qing Dynasty and abolished in 1984. The meaning of a place name once there was a Bai family who lived here and was located at the mouth of a ditch, hence the name Bai Kouzi. "Kouzi" has many meanings, as follows: 1, which is interpreted as referring to people, mouths, torn holes or cracks, precedents, departments or institutions; Refers to a port or intersection; Metaphor refers to a policy or practice. Often used in an incorrect way. 2. Kouzijiao Liquor, a specialty of Huaibei City, Anhui Province, is a symbolic product of chinese national geography.