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运行周期
agric.	run duration
avia.	sidereal period
el.	cycle length; duration of working cycle; operation cycle; operating cycle
el.mach.	cycle of operation
space	revolution period; period of revolution; orbital period
tech.	operational period; performance period; running cycle; running period
water.res., ecol.	operating period
客运运行周期
auto.	bus run cycle
运行〔轨道〕周期
commun.	orbit time
space	orbit period
绕轨道运行周期
astronaut.	orbital period
汽车运行周期
auto.	cycle of operations

运行周 期 : 27 phrases in 8 subjects

Automobiles	2
Electric machinery	4
Electronics	3
Metallurgy	3
Rail transport	2
Space	2
Technology	10
Telecommunications	1