"deal in" in Chinese (Simplified)
从事（买卖）经营
Definition
专门买卖某种商品，或从事特定类型的生意。较少情况下也指对某事有兴趣或涉足某领域。
Usage Notes (Chinese (Simplified))
主要用于商业语境，如“deal in rare books”（经营稀有书籍）。不要和 'deal with' (处理) 混淆。偶尔可引申为“以某物为手段”：如“deal in gossip”。一般较正式，日常口语中不常见。
Examples
They deal in used cars at their shop.
他们店里**经营**二手车。
This company deals in electronics.
这家公司**从事**电子产品的买卖。
He deals in rare books worldwide.
他在全球**经营**稀有书籍。
We only deal in cash, not credit cards.
我们只**接受**现金，不收信用卡。
Some people deal in rumors more than facts.
有些人更喜欢**传播**谣言而不是事实。
My uncle used to deal in art before he retired.
我叔叔退休前**从事**艺术品买卖。