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periodical maintenance
bridg.constr. 定期维修
hydroel.st. 定期保养
steel. 定期维护
tech. 定期养护; 定期检修
periodic maintenance
auto. 定期维护保养
avia. 周期维护
bridg.constr. 定期养护
econ. 定期维修
el. 中修
oil 定期保养; 定期检修; 定期维修保养
tech. 定期维护
periodical maintenance: 20 phrases in 5 subjects
Aviation6
Business1
Electronics1
Space2
Technology10

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