"I am a big-headed donkey, I am a stupid donkey" comes from the harmonization of the poem "Crouching Spring". The correspondence is as follows:

"Crouching Spring" (I'm a Stupid Donkey)

Dark Plums and Hidden Flowers (I'm uneducated),

Crouching Branches and Wounded Hateful Bottoms (I'm very low in IQ).

Remote smell lying like water (ask me who I am),

Easy to penetrate the spring green (a big stupid ass).

Shore like green (I am a donkey),

Shore like translucent green (I am a donkey),

Shore like translucent dai green (I am a dumb donkey).

"Crouching Spring" original paraphrase:

Darkly the plum blossom floats, full of plum blossoms pressing the branches to the bottom. Looking far away from the shore, the water is full of green. The shore is green, like emerald translucent green, beautiful.

Reference to the above: Baidu Encyclopedia - Harmonized Terrier

Reference to the above: Baidu Encyclopedia - Easy Translucent Darling Spring Green