单位切向量 dān wèi qiē xiàng liàng

DEFINITIONS

  1. unit tangent vector (math.)

CHARACTERS

单 dān single, individual, only; lone
位 wèi throne; position, post; rank, status; seat
切 qiē cut, mince, slice, carve
向 xiàng toward, direction, trend
量 liàng measure, quantity, capacity