n. 

坑
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bracteoid,
bracteolate,
bracteole,
bracteomania,
bractlet,
bracts,
brad,
bradawl,
Bradbury,
Braddock,
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astrobiologist,
astrobiology,
astrobionics,
astroblast,
astroblastoma,
astrobleme,
astrobotan,
astrobotany,
ASTROC,
astrocamera,