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活动支座
gen.	free-end
bridg.constr.	expansion bearing; freely movable bearing
hydroel.st.	movable bearing; movable support
met.	traveling support; travelling support
tech.	collapsible prop; expansion end bearing; free end; free support; movable bearing support; movable hearing
wind.	shifting bearing

活动支座: 14 phrases in 3 subjects

Automobiles	1
Bridge construction	6
Technology	7