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кислород
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[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en] |
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oxygen
A gaseous chemical element; an essential element in cellular respiration and in combustion processes; the most abundant element in the earth's crust and about 20% of the air by volume. (Source: MGH)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en] |
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