Is it a double rhetorical device to bow down and be a willing ox?

1, this is the most famous sentence in a poem by Mr. Lu Xun, self-deprecating.

2. Explain this poem:

Explanation: bash elbows: glare; A thousand fingers: everyone complains; Ruzi Niu: A person who is willing to serve others. Never give in to the enemy and be willing to serve the people.

2. The rhetorical devices used in this poem are:

(1) Comparison: For example, the comparison between "bashing" and "bowing"; '

(2) Metaphorically, compare yourself to a willing bull.