Being在这里是"现在分词being用作非谓语动词,充当独立主格中连系动词的"用法，又如：
It being a holiday, all the shops were shut.
由于今天是假日，所有商店都关门了。
The weather being hot, we had to stay at home.
由于天气炎热，我们只好呆在家里。
There being no further business, l declare the meeting closed.
没有再要讨论的事了，我宣布散会。
从语法书上查到的，希望能帮到您！
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