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hierarchical structure

avia. ★ 递阶结构
econ. 统属结构
oil 层次结构
space 层次［分级］结构
tech. 等级式结构; 分层构造
telecom. 分级结构; 分层结构
hierarchical structure
: 29 phrases in 15 subjects
Animal husbandry1
Automated equipment2
Automatic control1
Cartography1
Computer networks2
Desert science1
Ecology1
Electronic commerce1
Electronics2
Information technology4
Mathematics1
Scientific1
Space4
Technology5
Telecommunications2

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