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Jyutping pin1 zik6 syun1
Pinyin piān xì suān

Definitions (Wiktionary)
  1. noun, Taiwan
    metasilicic acid
    (syn.) 偏硅酸

[---]

Jyutping pin1 zik6 syun1
Pinyin piān xī suān

Definitions (Wiktionary)
  1. noun, Taiwan
    metasilicic acid
    (syn.) 偏硅酸