平面[píng miàn]
plane; two dimensions; flat surface
举例：
所有的行星大致在同一平面上绕太阳赤道运转。
All?the?planets?orbit?the?Sun?in?roughly?the?same?plane,?round?its?equator.?
《柯林斯高阶英汉双解学习词典》
baβ是“平面张量”的协变分量，叫做该曲面的曲率张量。
The?quantities?ba?β?are?the?covariant?components?of?a?plane?tensor,?called?the?curvature?tensor?of?the?surface.?
百度翻译例句库
我们得有个平面才能玩这个游戏。
We'll?need?a?flat?surface?to?play?the?game?on.?