旋转曲面 xuán zhuǎn qū miàn

DEFINITIONS

  1. a surface of revolution (math.)

CHARACTERS

旋 xuán
HSK 6
revolve, move in orbit; return
转 zhuǎn
HSK 4
shift, move, turn
曲 qū
HSK 6
crooked, bent; wrong, false
面 miàn
HSK 1
face; surface; plane; side, dimension