感光性的 (gam2 gwong1 sing3 dik1) — an actinometer in Cantonese
gamˊ²感gwongˉ¹光sing˗₃性dikˉ¹的简 暴光计
Mandarin Pinyin: bao4 guang1 ji4
Meaning of 感光性的
nounan actinometer
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