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Although speech is the most obvious form of communication, we do use other forms of which we may be only partially aware, or in some cases, completely unaware. (Para. 4)
Meaning: Although speech is the most obvious form of communication, we do use other forms of communication. We may be only partly aware of these forms, or in some cases, we may be completely unaware of them.
adj. 没有发觉的，不知道的
