Without gravity to help circulate air, the carbon dioxide you exhale has a tendency to form an invisible cloud around your head.

如果没有重力帮助空气循环，你呼出的二氧化碳会在你头顶周围形成一个看不见的云状物。

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You can sense temperature variations, proprioception (position of your muscles), and the force of gravity (you do this by knowing at what Angle your head is in while your eyes are shut).

你可以体会到温度变化，本体感受(体会到你每块肌肉的方位)和重力感(通过闭上眼睛时头部的角度来感知)。

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Instead, slam a spacecraft head-on into a dangerous rock to move it in a hurry, then fine-tune it with another spacecraft by using its gravity to pull the rock into a safe path.

而用航天器撞进危险的岩石，迅速移动它的位置，然后利用另一个航天器进行微调，并利用它的重力把这块石头拖进安全轨道。

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We have a cultural picture in our head of Isaac Newton as an upstanding British gentlemen who discovered gravity by having an apple fall on his head.

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Gravity was already established, smacking Newton upside the head with apples and everything else it could throw at him.

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Eventually, however, gravity ensues and the constraints outlined herein raise their head, resulting in a collapse to point C.

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