I am sorry, because consult the customs and confirm accurate arrival time, has not written a letter in reply in time, excuse me!

很抱歉，因为咨询海关确认准确的到达时间，未及时复函，请原谅！

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This permits accurate prediction of arrival time of the batch interface, shows how much mixing has occurred, and gives time to arrange switching the stream from one tank to another.

这样，可正确预测混油界面到站时间、有多少混油量，并有时间将来油从一个储罐切换到另一个储罐。

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As the computer clock is not accurate enough, the timer card also records time beats from Global Positioning System (GPS). This makes accurate timing of cosmic ray arrival feasible.

同时，由于电脑的内置时钟不够精确，计时器亦会记录来自全球定位系统的报时讯号，以便准确计算宇宙射线的接收时间。

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