adj. 
黑的
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Boolean operation,
Booleans,
boom,
boom town,
boomage,
boom-and-bust,
boombox,
boomer,
boomerang,
boomeranger,
相似单词
pull together,
pull up,
pull wires,
pull-apart,
pull-aside,
pullate,
pullback,
pull-back,
pull-behind,
pullboat,