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问题: sunnyday 求助分析句子~

He says travel by carriers of influenza, be they people in aeroplanes or birds on the wing,
means regional mutations quickly spread around the world. 请分析句子结构~还有翻译~谢谢!

解答:

He says travel by carriers of influenza, be they people in aeroplanes or birds on the wing, means regional mutations quickly spread around the world.

翻译:他说,不论是飞机上的人或者飞行中的鸟,这些流感病毒的携带者,迅速将地区性病毒突变扩散到全世界。

这里be they people in aeroplanes or birds on the wing是一种让步状语从句,省略whether的虚拟语气。一般来说,省略了whether,就把句子里的be动词原形提前到句首,表达“不论是。。。或者。。”