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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
periodic maintenance
: 15 phrases in 5 subjects
Aviation6
Business1
Electronics1
Space2
Technology5

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