并在常速扫描取得背景速度的基础上计算近似波阻抗。

Then approximate wave impedance is computed after background velocity has been obtained by making constant-velocity scanning.

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当然，彗星和背景恒星在行星地球的天空中运行速度是不一样的。

Of course, the comet and background stars move at different rates through planet Earth's skies.

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“这种背景下，自然中的速度极限就不一定是光速，”他说，“而实际上可能是中微子的速度。”

"With this kind of background, it is not necessarily the case that the limiting speed in nature is the speed of light," he said.

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