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码元 mǎyuán
oil	symbol mel音调单位
space	code element; symbol; element
电码单元
el.	code element

码元: 121 phrases in 20 subjects

Air defense	2
Artificial intelligence	1
Aviation	3
Business	1
Communications	4
Cryptography	2
Data processing	1
Earth sciences	1
Economy	1
Electronics	23
General	2
Information technology	17
Librarianship	3
Multimedia	4
Oil / petroleum	1
Rail transport	1
Space	18
Technology	15
Telecommunications	20
Wind Energy	1