异面直线 yì miàn zhí xiàn

DEFINITIONS

  1. (math.) skew lines

CHARACTERS

异 yì
HSK 6
different, unusual, strange
面 miàn
HSK 1
face; surface; plane; side, dimension
直 zhí
HSK 3
straight, erect, vertical
线 xiàn
HSK 4
line, thread, wire; clue