It retrieves a list of product categories from a database, and then passes them off to a view file to render an appropriate HTML response back to the browser.
它从数据库返回一列商品目录，然后将他们传到一个视图文件，并在浏览器上以合适的HTML呈现出来。
Specifically, the user groups and the back-end item database for that List are not cleaned up.
具体来说，将不会清除掉该List的用户组和后端项数据库。
Specifically, the user groups and the back-end item database for that List are not cleaned up.
具体来说，将不会清除掉该List的用户组和后端项数据库。
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