花园管理员说：所有预约者都能入园。小林预约了，能推出什么？All booked visitors may enter the garden. Lin has booked. What follows?
第 1 步：前提支持结论Step 1: Premises support a conclusion
先把论证的部件找出来。Identify the parts of the argument.
前提是用来支持结论的陈述。假设所有预约者都能入园。小林又已预约，就可推出小林能入园。逻辑检查推理联系。Premises are statements used to support a conclusion. If all booked visitors may enter and Lin has booked, Lin may enter. Logic examines the inferential connection.
第 2 步：有效不等于前提真实Step 2: Validity is not premise truth
推理形式好，就代表事实都对吗？Does a good form guarantee true premises?
演绎有效表示：前提都真时，结论不能假。若预约规则已取消，形式仍可有效。但这不能确认现实中的入园资格。Deductive validity means true premises cannot lead to a false conclusion. If the booking rule is no longer real, the form can remain valid without establishing actual permission.
第 3 步：小心倒推Step 3: Watch reversed inferences
已经入园，就能证明预约过吗？Does entry prove a booking?
不能只凭“预约就可入园”倒推。工作人员也可能无需预约。找到这种可能情形，便说明倒推没有被前提保证。Not from “booking permits entry” alone. Staff might enter without booking. Such a possible case shows that the reverse inference is not guaranteed.
🎮 你来探索与判断🎮 Explore and reason
先操作实践台，再用四个挑战检验理解。每次判断都能看见理由。Explore the practice table, then try four challenges. Each judgment comes with a reason.
一句话记住它：逻辑检查结论是否得到前提支持。Remember: Logic checks whether premises support a conclusion.
分清前提和结论。Distinguish premises and conclusion.有效性与真实性不同。Validity differs from truth.能入园不必然意味着预约过。Entry need not imply a booking.
来源与理解边界Sources and limits
本页采用经典演绎逻辑入门框架。概率推理与其他逻辑需要额外工具。This page introduces classical deductive logic. Probabilistic reasoning and other logics require additional tools.
来源查阅：2026 年 10 月 6 日。场景与例题为教学创作；插图为概念示意，不是历史实物照片。Sources checked on 6 October 2026. Scenarios and exercises are educational creations; illustrations are conceptual, not historical photographs.
参考上列公开资料 · AI 生成与自动化检查 · 欢迎提供可核查的勘误。Based on the public sources above · AI-generated and automatically checked · Verifiable corrections are welcome.
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