"狗口里生不出象牙"这个成语出自《庄子·逍遥游》。原文为：“北冥有鱼，其名为鲲。鲲之大，不知其几千里也；化而为鸟，其翼若垂天之云。自其身以下，不息如流，而焉能 Knowing that the word "狗口里生不出象牙" originates from "逍遥游" in The Book of the Later Han Dynasty, it can be understood as: “The north sea has a fish called鲲. It is said that the鲲's size is unknown to even those who understand it; it can change into birds and its wings are like a hanging cloud at the end of the sky. From what I understand in my own body down to the point where they cannot be stopped, but how can such a big fish, not able to fly as if bound by the wind, be born? In this case, both the鲲 and the bird are flying like a crane with their wings outstretched like a rainbow. The speaker of the text understands that the meaning of "狗口里生不出象牙" is: 'the large mouth of the dog can't eat all its food.' It tells us to focus on your own weaknesses, not to waste others' strengths, and not to follow others blindly."