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upper courses
el.
上游
;
上层
upper course
agric.
上游段
bridg.constr.
上层
construct.
上层〔游〕
desert.
上游
(河流)
eng.geol.
上游
tech.
上
砌
层
;
上游河段
;
上游
(段)
upper courses:
7 phrases
in 2 subjects
General
1
Technology
6
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