问题描述：
这句话的be 怎样来理解 是不是固定搭配有特殊意思?
Neurologists have known for years that staring at screens late in the evening can disrupt sleep- be they television screens,computer screens or mobile phone screens.
Neurologists have known for years that staring at screens late in the evening can disrupt sleep- be they television screens,computer screens or mobile phone screens.
问题解答：
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