I am sure you all know from physics class about how light moves in microscopic ways and that we can only see light when the wavelength of that light is in a specific range.

我相信，你们在物理课上都学过光是如何以微观的方式运动的，以及只有在光的波长在特定的范围内时我们才能看到光这一事实。

youdao

youdao

Mr Ravallion’s range captures the staggering growth of the emerging-market middle class.

拉瓦雷的定义范围见证了新兴市场中产阶级惊人的成长速度。

youdao

Compared with the poor and the rich, the middle class contains a greater range of interests.

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As in the previous two events, the Navy shot down an Aries rocket simulating a Scud class short to medium range missile.

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This represents the middle class getting richer, with incomes growing beyond the fixed income range, rather than a shrinking middle class.

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