用例常常会更改系统状态(例如，现在帐户余额下降了)，而不是生成实际产品。
Frequently a use case changes the state of a system (i.e. the account balance is now lower) rather than generating a physical product.
用例常常会更改系统状态(例如，现在帐户余额下降了)，而不是生成实际产品。
Frequently a use case changes the state of a system (i.e. the account balance is now lower) rather than generating a physical product.
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