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preliminary operation
busin.	准备作业
commer.	试运转
compr.	试运行; 初运转
el.mach.	试车
manag.	初步工序; 准备工序; 初步经营
tech.	装备工作; 现场施工准备; 预备操作; 试转
wind.	试行运转

preliminary operation: 2 phrases in 2 subjects

Aviation	1
Space	1