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gas mark
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gas exchange
gas ex·change


noun 
Definition:
 
transfer of gases: the transfer of gases between an organism and its environment, e.g. the process by which oxygen enters the body and carbon dioxide is expelled from it via the lungs
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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