What rhetorical devices did Yang Wanli's couplets use in transplanting songs, and what role did they play?

The antithetical couplets in Yang Wanli's Song of Transplanting Rice use figurative rhetoric, which shows that transplanting rice is a battle against time and highlights the hardships of labor.

Precautions:

① Dou: Helmets used in ancient wars. Gun: that is, hemp fiber, grass or brown, is a rain-proof appliance worn on the body. A: Protective equipment made of metal or leather.

② Scapula: Scapula. This refers to the shoulder.

Transplant songs. Yang Wanli

Fu Tian threw the seedlings to the woman, and the children pulled them out and put them in.

Dai Li is a beggar, and the rain drips from head to shoulder. -Couplets

When eating, ask the canal to rest for half a minute, but bow your head and bend over just not to pick it up.

Take care of geese and ducklings when the roots of seedlings are not firmly twisted.