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物质循环作用
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物质循环作用
role in cycle of matter
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lever pin
lever press
lever principle
lever pry bar
lever punch
lever punch press
lever pusher
lever ratio
lever relationship
lever release valve
lever relief valve
lever reversing gear
lever riveter
lever roller
lever rule
levers
lever safety valve
lever scale
lever-set punch
lever shaft
lever shaft arm
lever shaft nut
lever shaft packing
lever shaft plug
lever shears
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