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。

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Because there is no water in the body of the Tardigrade while in a cryptobiotic state to aid metabolism, the Tardigrade cannot go through any physical changes (from self) while dehydrated.

因为在缓步动物的身体里没有水，而在隐生状态下恢复新陈代谢，又不能通过自身的改变来完成。

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