旋转地

The young people gyrated on the dance floor.

这些年轻人在舞池里不停。

The propeller started to spin around.

螺桨开始飞起来。

As our nebula began to collapse under its own gravity and spin faster, a dense clump of matter formed in the center. It's called a protostar.

当我们的星云在自身重力作用下崩溃和时，星云中心形成了密集的物质块。这叫做原恒星。