暗箱操作 (am3 soeng1 cou1 zok3) — black case work; block box operation in Cantonese
am˗₃暗soengˉ¹箱couˉ¹操zok˗₃作Mandarin Pinyin: an4 xiang1 cao1 zuo4
Meaning of 暗箱操作
nounblack case work; block box operation
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