This is the 839th most frequent Chinese word.
上市
"上市" means "to go public" (e.g., a company listing on the stock market) or "to hit the market" (e.g., a product being released).
In this sentence, '上市' refers to the action of a company going public on a stock exchange.
这家公司预计明年上市。
This company is expected to go public next year.
Here, '上市' is used to describe the introduction or launch of a product into the market.
这些新款手机刚刚上市就卖光了。
These new smartphone models sold out immediately after being launched.
In this context, '上市' expresses the release of a product (here, a book) to the market or public for sale.