数学老师用粉笔在黑板上画了一个无限延伸的平面。

The math teacher drew an infinitely extending ___plane on the blackboard with chalk.

我们乘坐的航班因天气原因延误了。

Our ___plane was delayed due to bad weather.

他们的讨论很快上升到了哲学层面。

Their discussion quickly ascended to a philosophical ___plane.

木匠用刨子将木板表面修整光滑。

The carpenter used a ___plane to smooth the surface of the wooden board.