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The two-sphere model arises from some very simple observations of the stars which anyone can make.
这种双球面学说是根据任何人都能做到的对星星的简单观察而提出的。
In contrast to the simple observations of the tides, tidal current studies are difficult and expensive.
与潮汐的简单观测不大相同,潮流研究的难度既大、费用也巨。
Observations, which to an outsider might sound like simple things, are often remarkably difficult, and depend on complex models to make any sense at all.
对于门外汉来说可能是件简单的事情,但是这样的观测常常是很难进行的,并且需要依靠负责的模型来解释一切。
Now let's talk about some simple observations on isothermal gas expansions.
接下来我们讨论几条,关于绝热膨胀的性质。
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