Chinese, but not just those students, have a hard time with the word down. It's the OW diphthong, OW, plus the N consonant. And they kind of mix the N into the diphthong and nasalize it. Down.
中国人,但不仅仅是那些, 难解词。 它是 OW 双元音 OW,加上 N 辅音。 他们将 N 混合到双元音中并将其鼻音化。 吃下。