It would be much better if you had a reference point that didn't care where the pressure was.

我们还需要精确地定义气压,你必须知道气压的大小,当然如果我们能找到一个。

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And some of this important to your health and well being-- certainly to health and well being of populations, so we need to know these.

有的知识对于你的健康和生活,对于人们的健康和生活当然非常重要,所以我们必须了解

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