相对运动的方向

beacons, which emit radiation, locating, direction-finder

direction non-equilibrium factor of passenger flow【交】

signal transmission of LF- in one and HF-signals in the other direction

controlling for stock travelling otherwise than in the direction of the material

reversal of rotational direction (reversal of rotation)

proximodistal direction of development

automatic direction finder

method by series【测】;method of direction observation【测】