用提问检验理解

围绕学习材料设计一次一问的练习。先用一个具体问题检验基础理解，等待我的回答后再继续。反馈要引用材料，说明回答中正确的部分和缺失的推理，再给一个可迁移的小例子。不要一开始列出整套答案；根据实际回答调整难度。

输入材料：
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目标与约束：
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只依据输入回答。缺少关键信息时明确标记未知，必要时先提问。输出应可直接用于当前任务。

Create a one-question-at-a-time learning session. Start with a concrete question that checks basic understanding, then wait for my answer. In feedback cite the material, explain what is correct and which reasoning is missing, and offer a transferable example. Do not reveal all answers at the start; adjust difficulty to my responses.

Input material:
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Goal and constraints:
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Base the response on the input. Mark missing information as unknown and ask essential questions when needed. Make the output directly usable for this task.