1. Pure grain wine refers to a category of liquor, and all liquors sold in the market meet this standard. Therefore, the label "pure grain wine" on the bottle cap is to emphasize that it is fermented from 100% grain; "Export small square bottle" is a special packaging method, mainly designed for export market.

2. Pure grain wine is sold in bottled form and marked on the bottle cap to distinguish different brands or styles of liquor; "Export small square bottle" refers to a specific bottle type, which is a unique bottle type designed for export market and can adapt to specific market demand and consumer preference.