所以我哋做咗個 未算好準確嘅光譜測量儀 你可以用光照唔同嘅物質 然後就可以得出唔同嘅光吸收譜 咁樣就可以幫你分辨出水裡面有咩物質
So we made a spectrometer that wasn't very accurate, and you could use light to light different substances, and then you could get different absorption spectra, so that you could help you tell what's in the water