Russian translation: в данном контексте лучше переводить как отсутствуют
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08:18 Aug 5, 2004
English to Russian translations [PRO] Law/Patents / chemistry
English term or phrase:nothing
R8 and R9 are individually and respectively selected from the group consisting of nothing (i. e. , the groups are non-existent), CH2, C2H4, and C3H6,