黑箱 hēixiāng black box Origin Definitions Defs Strokes Stroke Words Sentences Sents 1 sentence 它们就像黑箱，其内部运作是神秘的。 tāmen jiù xiàng hēixiāng, qí nèibù yùnzuò shì shénmì de. They are like black boxes whose inner workings are mysterious. Source: CCMatrix