At present paper, we deduced the relative velocity distribution of mixed ideal gas molecule. Then we got the average collide frequency and average free distance.

本文导出了混合理想气体中分子相对速度的分布，并由此计算了混合理想气体中分子的碰撞频率和平均自由程。

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But our kids are growing up in an age when long distance is free on their cell phones.

但我们的孩子则生长在打长途免费的年代。

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Cell phones are a travel necessity nowadays, multitasking as alarm clocks, not to mention free long distance calls.

如今，手机是出游的必备品，可以当闹钟用，当然更少不了免费的长途电话了。

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And the telephone companies in the United State, generally about 200 billion dollars a year carrying long distance telephone conversations and they thought this conversations might be carried for free over the internet was quite shocking to them. Of course free is very low price, and they are not like it to be free.

美国的各电话公司，一般大约有每年2千亿美元,来自长途电话会话，他们认为,这些会话有可能通过互联网免费传输,对他们来说是相当震惊的，当然了,免费是很低的价格了，他们不希望它免费。

麻省理工公开课 - 媒体、教育、市场课程节选

and Maybe this will go a little bit of the distance towards answering it Human beings learn that they were able to do that, that they are free moral agents. They find that out.

这是真的，还有，It，is，true—,或者距找到答案还有一段路程,人们才知道他们能够这样做，他们是有自由道义的个体，他们发现了这点。

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Tesla is taking a slight cost risk that ultimately all customers will want to buy the Supercharger upgrade and receive unlimited, free long distance travel for life.

ENGADGET: Tesla Model S axes 40 kWh battery option, surpasses sales goals

Another unnecessary cost: employees who call a company-paid 800 number to retrieve voice mail from their desktop phone instead of using free long distance on a cell phone.

FORBES: Magazine Article

But Bruno Aguiar's superb free-kick from distance drew Hearts level 13 minutes before half-time.

BBC: Hearts 1-1 Celtic