zài / lǐxiǎng / de / ōujǐlǐdé / píngmiàn / shàng / píngmiàn / běnshēn / jùyǒu / líng / qūlǜ在理想的欧几里得平面上,平面本身具有零曲率。In an ideal Euclidean plane, the plane itself has zero curvature.