forming an integral part
The Chinese idiom, Pinyin h ù w é IBI ǎ ol ǐ, means that a is the exterior of B and B is the interior of a; it refers to interdependence and mutual acceptance.
source
The biography of Dong Yunzhuan in the annals of the Three Kingdoms by Chen Shou of Jin Dynasty: Chen Zhi acted as a servant on behalf of Yun and interacted with Huang Hao.
usage
There must be more than two subjects.
forming an integral part
achieve mastery through a comprehensive study of the subject - yān huì guàn tōng
win a noble position for oneself and for one 's wife and leave it to one 's posterity - fēng qī yìn zǐ