x-refthe written abbreviation of millimetre or millimetres/ millimetre或millimetres的书面缩写,毫米
mm2 /m/ → am, hm
HEARAGREEused when someone else is speaking and you want to show that you are listening, that you agree with them, or that you are thinking about what they have said 嗯,呣〔表示在聆听、赞同,或在思考别人所说的话〕