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。
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。
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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