单叶双曲面 dānyèshuāngqūmiàn hyperboloid of one sheet Origin Definitions Defs Strokes Stroke Words Sentences Sents 单叶 單葉 dānyè simple leaf A leaf where only one blade grows from a single leafstalk, such as a maple or poplar leaf.双曲面 雙曲面 shuāngqūmiàn hyperboloid (math) hyperboloid