Comparison with “Business”: In English, “business” is a very broad term. In Chinese, there's a key distinction.
贸易 (màoyì) is more formal and refers to the system or field of trade, especially on a national or international level. It's about commerce as a structured activity. In contrast,
生意 (shēngyi) is more colloquial and can refer to a specific deal, a small shop's daily transactions, or the general state of “doing business.” You would discuss a country's
贸易 policy, but ask a shopkeeper how their
生意 is.