Spectrum Complete range of colours within the visible light, I. E. Between the wave-length of 400 nm to 700nm.
可见光内的全部色光系列。即光波在400至700纳米之间的排列。
The waves are not noticeable out at sea because of their long wave length.
这些海浪在海上看起来不是很明显,因为它们的波长很长。
What is the meaning of "the length of a wave" according to paragraph 3?
根据第三段,“the length of a wave” 是什么意思?
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