Now, of course, we've got to have units and the units for lengths are going to be meters.
当然,这里还得有单位,长度的单位是"米"
It's always good when we're looking for a wavelength that our answer is in a unit of length, that's a good sign already.
当我们计算波长时,如果答案是一个长度单位,那就是一个好的迹象。
So what we do is we pick an origin, call it zero, we put some markers there to measure distance, and we say this guy is sitting at 1,2,3,4,5.
我们现在选择一个原点,称其为零点,我们做一些标记来测量距离,这个点在五个单位长度的地方
That's a new unit of length.
那是一个新的长度单位
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