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Science is based on experiment, on a willingness to challenge old dogma, on an openness to see the universe as it really is.Accordingly, science sometimes requires courage—at the very least the courage to question the conventional wisdom. (Carl Sagan, Broca’s Brain: Refilections on the Romance of Science) 科学是建立在实验的基础上，建立在愿意挑战旧教条的基础上，一种看到宇宙真实面目的开放。因此,科学有时需要勇气——至少是质疑传统的勇气智慧。(卡尔·萨根《布洛卡的大脑:对科学传奇的反思》)

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Do not play your sound system loudly as you may not be able to hear warning sirens from emergency vehicles. In addition, hearing damage from loud noise is almost undetectable until it’s too late. (car owner’s manual) 不要大声播放你的音响系统，因为你可能听不到警告救护车鸣笛此外，噪音对听力的损害，噪音几乎无法察觉，直到为时已晚。(车主手册)

The invention or discovery of symbols is doubtless by far the single greatest event in the history of man.Without them, no intellectual advance is possible; with them, there is no limit set to intellectual development except inherent stupidity. (John Dewey, The Quest for Certainty) 符号的发明或发现无疑是迄今为止最伟大的。这是人类历史上的一件大事。没有它们，就没有智力上的进步可能的;有了它们，智力发展就没有限制，除了固有的愚蠢。(约翰·杜威《寻求确定性》)

You know how I know animals have souls? Because on average, the lowest animal is a lot nicer and kinder than most of the human beings that inhabit this Earth.你知道我怎么知道动物有灵魂吗?因为平均而言，最低等的动物比大多数居住在这个地球上的人类要友好和善良得多。

No sharks are pets, since no barracuda （梭鱼类）are pets, and no sharks are barracuda.