在指示牌上添加一些文字说明你这么关心动物消失的原因。
Add some texts in the sign to make it clear why you care about the loss (丧失) of animals.
换句话说，如果SAD中的指示，连同实际的用例规格说明对开发人员来说足够构建用例的代码，那么用例实现就是空的。
In other words, if the directions in the SAD together with the actual Use-Case Specification are sufficient for the developer to build the code of the use case, the Use-Case Realization is empty.
要确保你得到了医生的正确指示说明，并定期让医生复查你的检查技术。
Be sure to get proper instruction from your doctor and have your technique reviewed regularly.
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