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信函 xìnhán
archit.	correspondence
commer.	cover; favour
proj.manag.	communication
radio.amat.	letter
tech.	letter
textile	circular; favor
信函亦缩为 LTTR xìnhán
commer.	letter

信函: 137 phrases in 26 subjects

Advertising	3
Agriculture	2
Air defense	1
Aviation	7
Business	15
Commerce	4
Construction	1
Desert science	1
Economy	12
Electronics	5
Finances	1
General	2
Information technology	6
International Monetary Fund	1
International trade	6
Librarianship	1
Multimedia	1
Oil / petroleum	1
Project management	4
Rail transport	1
Securities	12
Space	2
Technology	14
Telecommunications	20
Textile industry	12
Work flow	2