Day 4-Space and Time

其实，passage的生词并不多，但是在理解上会有些问题，所以做思维导图的时候应该会很痛苦。

Vocabulary

demonstrate 证明；操作示范

It is said that Galileo demonstrated that Aristotle's belief was false by dropping weights from the leaning tower of Pisa.

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acceleration n.加速

(For example, the acceleration is twice as great if the force is twice as great.)

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proportional 成比例的 

…which states that every body attracts every other body with force that is proportional to the mass of each body.

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rotation n.

For example, if one sets aside for a moment the rotation of the earth and its orbit round the sun, one could say that the earth was at rest and that a train on it was traveling north  at ninety miles per hour or that the train was at test and the earth was moving south at ninety miles per hour. 

改变参照物来进行研究

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stub n. 烟蒂

stub out 把 ……熄灭

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unambiguously 不含糊地

eclipses 日食，在The Science里其实有提到

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propagation 繁殖 n.

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equations n.   方程

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infrared 红外线的

ultraviolet 紫外线的

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postulate假设 assume

platinum铂

coordinate 坐标

ripple细浪

cease减少

      decrease

geodesic区面几何

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navigator领航人

navigation 导航

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dynamic adj.有活力的

                 n.活力