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airlock ['eəlɔk] n
transp.	acumulação de ar; bolsa de ar
English thesaurus
airlock ['eəlɔk] n
mil., logist.	In collective NRBC protection systems, compartment located between the area free of toxic substances and the contamination control area with which it communicates through two doors. It is cleansed by fresh air so as to enable personnel to cross from one area to the next without letting anyone enter the area free of toxic substances. (FRA)

airlock: 3 phrases in 2 subjects

General	2
Nuclear and fusion power	1