"The wind blows the branches of Yang Liuzhi, and the big branches swing the tail branchlets!" Who knows what this Cantonese sentence means?

Yang Liuzhi's branches sway with the wind-willow trees sway with the wind, and "branches" refer to every branch.

When the big branches swing, the small branches swing-when the big willow branches don't swing, the small willow branches swing.

What you see over there is an incomplete Cantonese poem. You have to look at one sentence or the next to analyze its extended meaning.