(pos:形容詞)
<explanation>
yue:運作嘅過程唔公開畀大眾知道
eng:behind the scene; under the table; literally "black box"
<eg>
yue:黑箱作業 (hak1 soeng1 zok3 jip6)
eng:to operate without any transparency
<eg>
yue:佢哋請人好黑箱㗎，唔好嘥時間去申請喇。 (keoi5 dei6 ceng2 jan4 hou2 hak1 soeng1 gaa3, m4 hou2 saai1 si4 gaan3 heoi3 san1 cing2 laa3.)
eng:They make their hiring decisions behind closed doors, so don't waste your time applying.