hēixiāng zuòyè

== Mandarin == === Romanization === hēixiāng zuòyè (Zhuyin ㄏㄟ ㄒㄧㄤ ㄗㄨㄛˋ ㄧㄝˋ) Hanyu Pinyin reading of 黑箱作業 / 黑箱作业