平面[píng miàn]
plane; two dimensions; flat surface
舉例：
所有的行星大致在同壹平面上繞太陽赤道運轉。
All?the?planets?orbit?the?Sun?in?roughly?the?same?plane,?round?its?equator.?
《柯林斯高階英漢雙解學習詞典》
baβ是“平面張量”的協變分量，叫做該曲面的曲率張量。
The?quantities?ba?β?are?the?covariant?components?of?a?plane?tensor,?called?the?curvature?tensor?of?the?surface.?
百度翻譯例句庫
我們得有個平面才能玩這個遊戲。
We'll?need?a?flat?surface?to?play?the?game?on.?