在几何学中，平面是一个无限延伸的二维表面。

In geometry, a ___plane is an infinitely extending two-dimensional surface.

我们的航班延迟了，所以飞机还没起飞。

Our flight was delayed, so the ___plane hasn't taken off yet.

他们的讨论完全在不同的层面上进行。

Their discussion was on a completely different ___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.