Thinking Step 2: 推理第一个人。如果他不想要，他会直接说“不”（因为只要有一个不要，全称命题为假）。他说“不知道”，说明他自己想要，但他不确定后面两个人想不想要。
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Mosquitos began biting humans more than a million years ago | An analysis of 38 modern mosquitoes’ DNA suggests an ancestral mosquito species developed a preference for feeding on early humans between 2.9 and 1.6 million years ago,，更多细节参见safew官方版本下载
這種回應，道出了不少台灣年輕人的心聲。他們被稱為「民主富二代」，一出生就擁有言論自由與選舉權，卻未必明白台灣民主從何而來，或是二二八對台灣民主運動史的意義。
Some policymakers think that climate-friendly policies are impeding the adoption of green hydrogen. They should ask scientists to review the evidence.