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二级结构 èrjí jiégòu
agric.	secondary structure (structura secundaria)
biotechn.	two-level structure
space	two level structure
sport., med.	secondary structure
DNA 二级结构
genet.	secondary DNA structure
RNA 二级结构
genet.	secondary RNA structure
tRNA 二级结构
genet.	secondary tRNA structure
mRNA 二级结构
genet.	secondary mRNA structure
rRNA 二级结构
genet.	secondary rRNA structure
二级〔辅助〕结构
phys.	secondary structure

二级结构: 17 phrases in 6 subjects

Agriculture	8
Chemistry	1
Genetics	4
Molecular genetics	1
Polymers	1
Technology	2