这是一句独立主格结构，现在分词有时可以有自己的独立逻辑主语，这种主语通常是名词或代词的主格，置于现在分词之前，二者构成一种分词的独立结构。现在分词的独立结构常常作状语，置于句首、句末或句中，如：

The dark clouds having dispersed, the sun shone again.

My father being sick, I had no choice but to give up university.

Weather permitting, we'll have the match tomorrow.

Their room was on the third floor, its window overlooking the sports ground.

Only three fissile substances are known at present, these being uranium 235, uranium 233 and plutonium.

It being Sunday, we had a picnic in the suburbs.

现在分词独立结构之前可以用介系词with，带with的独立分词结构比较口语化。

With Mr. Ade taking the lead, they decided to set up a trading company.

介系词without也可以引导现在分词独立结构。

The war was over, without a shot being fired.

希望我能帮助你解疑释惑。

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