accumulate
加入词篮harden
launch
copper
tin
nickel
thin
concentrate
condense
react
air
sky
mix
blend
emit
split
move
revolve
spin
turn
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stretch
compress
shrink
integrate
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reflect
focus
vibrate
quake
interfere
conduct
keep
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contaminate
preserve
protect
pollute
renew
recycle
reproduce
sustain
erode
evolve
civilize
civilise
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sacrifice
pronounce
accent
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identify
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