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to phrases
贝尔系统
busin.
bell system
美国
贝尔系统
1984 年解体,现为 AT&T
telecom.
Bell System
贝尔 系统
:
23 phrases
in 8 subjects
Aviation
2
Earth sciences
2
Electronics
10
General
1
Nuclear physics
1
Space
1
Technology
4
Telecommunications
2
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