| 单词 | unilateral surface | 
| 释义 | unilateral surface [¦yü·nǝ`lad·ǝ·rǝl `sǝr·fǝs]  MATHEMATICS A one-sided surface; equivalently, any nonorientable two-dimensional manifold such as the Möbius strip and the Klein bottle.  | 
	
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