单词	air-traffic control
释义	air-traffic control 空中交通管制
随便看	portable skid resistance tester Portable sleep monitor portable slewing crane portable slit lamp portable slotting machine Portable Small Computer Requirements Contract portable socket-outlet portable software portable software environment portable soil mix plant portable soil tester portable sonar portable sound analyzer portable sound film projector portable sound grader portable sound slide projector portable soup portable source portable speaker-amplifier combos portable speaker system portable spectator stand portable spectrometer portable spectrophotometer portable speed calling list portable speed detection