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1 кислород в воздухе составляет около 21%
Makarov: oxygen accounts for around (или about) 21 % of the total, oxygen amounts to around ( или about) 21 % of the total, oxygen constitutes around (или about) 21 % of the total, oxygen makes up around (или about) 21 % of the total, oxygen runs around (или about) 21 % of the totalУниверсальный русско-английский словарь > кислород в воздухе составляет около 21%
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