那是个明朗无雾的夜，霜气凛人。

It was a fine dry night, frost in the air.

youdao

由雾白色标注的油管和环空A处也能看到流动（有流动），而深蓝色的环空B处显示无流动（无流动）。

Flow can be seen in the tubing and in annulus A (Flow), distinguished by the white mist coloring, while annulus B is dark blue indicating no flow observed (No Flow).

youdao