What does it mean to entrust orphans to Bai Di?

In Romance of the Three Kingdoms, Liu Bei was dying in Baidicheng after losing the war with Soochow, so he recruited Zhuge Liang to Baidicheng and entrusted his son, the late ruler Liu Chan, to Zhuge Liang. In the History of the Three Kingdoms, it is recorded that the late master cried: "You are only ten times as good as Cao Pi, and you will be able to secure the world and achieve great things in the end. If the heir can supplement it, supplement it; If you are incompetent, you can take it yourself. "

In the Three Kingdoms, Baidicheng entrusted orphans: When Liu Bei was dying, he called Zhuge Liang, the prime minister, and Li Yan, the minister, to entrust orphans and ordered him to assist his son Liu Chan. During this period, Liu Bei had a conversation with Zhuge Liang, which was recorded in the biography of the Three Kingdoms: In the spring of the third year of Zhang Wu (223), the ancestor Yu Yongan was seriously ill and called Liang in Chengdu. If the heir can supplement it, supplement it; If you are incompetent, you can take it yourself. "Bright tears said," I dare to use all my strength to serve Loyalty Day and then die! "The first Lord also wrote a letter to the later lords, saying," If you work with the Prime Minister, you are as good as your father. "