zài / gāo děng / shù xué / kè shàng / lǎo shī / huà / le / yí gè / dān yè shuāng qū miàn / gěi / wǒ men / kàn在高等数学课上,老师画了一个单叶双曲面给我们看。In advanced mathematics class, the teacher drew a hyperboloid of one sheet for us to see.