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backward class
落后班
backward class
backward compatibility
backward compatible
backward conditional ...
backward conditional ...
backward counter
backward country
backward creep
backward crosstalk
backward current
backward curvature
backward curve blade
backward curved blade
backward curved fan b...
backward curved vane
backward decay
backward deduction sy...
backward diagonal
backward dictionary
backward difference
backward difference m...
backward difference o...
backward differentiat...
backward differentiti...
backward diode
backward dislocation
backward drainage
backward eccentric
backward echo
backward edge
backward effect
backward elimination
backward elimination ...
backward equation
backward erosion
backward error
backward error analysis
backward error recovery
backward extrusion
backward extrusion die
backward failure
backward feed
backward field impedance
backward field torque
backward file recovery
backward finite diffe...
backward flashover
backward flow
backward flow problem
backward flow process
backward folding
backward forward counter
backward gain
backward gear
backward going
backward haulage
backward heart-failu
backward heart-failure
backward hold
backward impedance
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