How to pronounce 波長 in Cantonese (4 out of 5):

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波長大概是13.3納米
wavelength of about 13.3 nanometers.

Cantonese Sentence Breakdown

波長 bo1 coeng4
wavelength
大概 daai6 koi3
probably
是 si6
is
納米 naap6 mai5
nanometer

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