接下来是细菌域，细菌作为传染疾病的媒介为人们所熟悉，但是实际上它们对于生态环境至关重要。
Then there are the bacteria—familiar as agents of disease, but actually ecologically crucial.
媒介作为整个社会系统之子系统，有其独特的内外环境。
Media, as a subsystem of the entire social system, has its distinctive circumstance.
媒介作为整个社会系统之子系统，有其独特的内外环境。
Media, as a subsystem of the entire social system, has its distinctive circumstance.
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