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C:N ratio
agric.	碳氮比C:N比
C-N ratio
agric.	碳氮比［率］; C-N比［率］
C/N ratio
chem.	碳氮比
C-N carbon-nitrogen ratio
tech.	碳氮比

C/N ratio: 3 phrases in 2 subjects

Desert science	1
Ecology	2