不得而知bùdé’érzhīcannot be known; unable to find outHSK 7-9Pronunciationbùdé’érzhīExample sentence这件事的真相究竟如何,至今仍然不得而知。Zhè jiàn shì de zhēnxiàng jiūjìng rúhé, zhìjīn réngrán bùdéérzhī.The truth of this matter remains unknown to this day.Read and choose an answerOne fixed sampleExplore a sample