"HM" can refer to many things, such as international clothing brand H &；; M, "hero mode" in video games, or "hold me tight" in online chat. But in spoken language, the most common "HMM" is the abbreviation of "hmm". This word usually means contemplation, hesitation, uncertainty or distraction. When you don't know how to answer a question or need to consider something, you can use "hmm" to express your state of mind

In spoken English, the use of "HM" needs to judge its intention according to the context and mood. If you feel uncertain or need to think before you can answer a question, you can use a short "hmm" to express this state. But if you use "hmm" for a long time, people may think you are stalling or impatient. Therefore, the use of "HM" needs to be chosen according to the occasion and context.

If "HM" mainly expresses the state of thinking and hesitation, there are some similar expressions in spoken English, such as "let me see", "hmm" and "you know". These expressions also mean to express the state of thinking and hesitation, and can also be used to create short silence and thinking time. Different expressions may have different tone and intonation, so it is necessary to choose the appropriate expression according to the context and occasion.