That's another invention of the 1600s, by the way-- the thermometer. And they learned that concept-- perfectly natural to us--temperature.

顺便说一下,温度计也是十七世纪的发明,那时候的人才刚刚开始理解温度的概念,虽然对我们来说这是个很自然的概念

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It seems perfectly natural to ascribe fear to Hal.

赋予哈尔恐惧感,这似乎也是自然而然

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And here's a perfectly straightforward and natural explanation.

这有一种直截了当的解释

耶鲁公开课 - 死亡课程节选