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obstacle clearance ['ɔbstək(ə)l 'klɪ(ə)rəns]
commun., transp. altezza ostacoli
transp., avia. margine di sicurezza sugli ostacoli
transp., polit. margine di sicurezza sugli ostacoli
obstacle clearance: 9 phrases in 3 subjects
Communications1
Power lines1
Transport7