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direct-return system
archit.	直接回水制系统
construct.	直接回水制
ecol.	直接回水系统
direct return system
hydroel.st.	异程式系统
tech.	直接回水系统; 异程回水式系统; 直接回水制

direct-return system: 5 phrases in 2 subjects

Rail transport	2
Technology	3