还有一例我们每天都会遇到，公交车，火车以及其他形式的公共交通都设有妇女专座。

Reservation for woman in buses and trains and other forms of public transport is another example we deal with everyday.

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即，“购买购物车中的商品”用例必须要使用“注册用户”，但“注册用户”只是在“浏览商品目录”之前-- 它并不是一个必要条件。

That is, "registering a customer" is required by the "buying items in shopping cart" use case, but it simply precedes the "browsing the catalog" use case -- it's not a requirement.

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该实例讨论了从远程系统中读取购物车的用例。

This example discusses the use case of reading a shopping cart from a remote system.

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