backscratcher
backrest
backpacking
backpacker
backpack
backset
backside
backslide
backsliding
backspace
backstage
backstroke
backtrack
backup
backward
backward(s)
backwardness
backwards
backwards (also backward)
backwash
backwater
backwoods
backwoodsman
backyard
bacon
bacteria
bacterial
bactericidal
bacteriologist
bacteriology
bacterium
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backset

n. 倒退,逆流,涡流



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