comb Two laser combs with different repetition frequency are

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comb
Two laser combs with different repetition frequency are used here for determination of the corresponded comb number n and n+m.
在这句里是啥意思啊,实在搞不懂!

译文：
此处用两个重复频率不同的合成激光来确定相应的合成数量n和n+m.
此处的comb是combination的缩写/简称.
comb number是指“合成的数量”

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