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free as the air
自由自在, 行动自由
free as the air
free as the wind
free asphalt
free assets
free association
free associative algebra
free associative ring
free at quay
free at wharf
free atmosphere
free atom
free auxin
free available chlorine
free available chlori...
free baggage allowance
free balance
free balloon
free band
free banking principle
free banking system
free bar
free base
free beam
free bearer
free bearing
free beaten stock
free beating
free bed
free bench
free bend
free bend ductility
free bend test
free bilirubin
free bitumen
free black
free blade
free block
free block control block
free block control table
free block queue element
free blowing
free board during max...
free boarder
free body
free body balance equ...
free body diagram
free bollard
free bone fragment
free Boolean algebra
free border
free boundary
free boundary electro...
free boundary problem
free box wrench
free breakage
free bulkhead
free burden
free burning coal
free burning mixture
free business
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