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回转环
hydroel.st.	return ring
tech.	pivoted loop; swivel
wind.	slewing ring

回转环: 28 phrases in 10 subjects

Automobiles	1
Bridge construction	1
Compressors	1
Earth sciences	2
Engineering geology	5
General	1
Gymnastics	6
Hydroelectric power stations	2
Refrigeration	1
Technology	8