黑箱操作 hēi xiāng cāo zuò 🔊 see 暗箱操作[an4 xiang1 cao1 zuo4] + Keep this word Meanings hēi xiāng cāo zuò see 暗箱操作[an4 xiang1 cao1 zuo4] Its characters 黑hēiblackHSK 5箱xiāngbox操cāoto grasp作zuòto do; to engage in