I had been sitting in geometry class for two hours, waiting for the professor to conclude his lecture about concentric circles and concaved figures.

我已经上了两个小时的几何课，一直等着教授结束这个关于同心圆和凹面图的讲座。

youdao

I had been sitting in geometry class for two hours, waiting for the professor to conclude his lecture about concentric circles and concaved figures.

我已经上了两个小时的几何课，一直等着教授结束这个关于同心圆和凹面图的讲座。

youdao