coupling mechanism between upper level and low level jet
fiscal system at county level and township level
interaction between upper level and lower level
municipal level and county level
2-D direction of arrival
2-D direction of arrival estimation
2-dimensional direction of arrival
2wire double direction
A Borel direction of largest type
a law of run in opposite direction
a law of run in the opposite direction
A new valve of electric hydraulic control exchange direction
abrupt change in direction
abutment pressure of side direction