Chinese translation: 采用低强度测量系统的另外一个缺点是两个光束产生的激光标准具效应必须相似，这样二者相减时才能相互抵消。
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10:40 Nov 29, 2004
English to Chinese translations [Non-PRO] Tech/Engineering - Physics / optics and spectroscopy
English term or phrase:for cancellation when subtracted
Another disadvantage in using light intensity measuring systems is that the etalon effect(?) in the two beams must be similar for cancellation when subtracted(?).请帮助看一下句子中的两个问题，万分感谢。