"主要商品批发商" can be translated into English as "major commodity wholesaler" or "principal commodity wholesaler".
"Major" or "principal" both convey the idea of being significant or important.
"Commodity" refers to goods that are bought and sold in large quantities, often used in trade contexts.
"Wholesaler" is the term for a business that sells goods in large quantities to retailers, other businesses, or institutions, rather than directly to consumers.
Both translations are accurate and can be used depending on the specific context and preference.