平面

jīn nián hǎi píng miàn kě néng huì gāo chū xǔ duō

今年海平面可能会高出许多。

This year sea levels could be much higher.

píng miàn jǐ hé hěn nán

平面几何很难。

Plane geometry is difficult.

zhè liǎng tiáo xiàn bù zài yī gè píng miàn shang

这两条线不在一个平面上。

The two lines are not in the same plane.