What is the thorn stock hanging head and where does it come from?

1, the thorn head means that the hair is tied to the beam, and the awl pricks the thigh to improve spiritual study, which is a metaphor for studying hard.

2. Stabbing stocks comes from "Warring States Policy Qin Ce I": "(Su Qin) wants to sleep when studying, and he is tempted to stab his stocks." "Taiping Yu Lan" Volume 363 quotes Hanshu: "Sun is a treasure of literature, eager to learn, and never stops in the morning and evening. When he sleeps, he ties his head with a rope and hangs the beam. "

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