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backstop
A barrier to catch missed balls or errors.
backstory
history of a character before the main events
backstreet
A less traveled road, often quieter.
backstroke
A swimming style performed on the back.
backtrack
To retrace one's steps or decisions.
backup
an extra person or thing ready to help
backward
toward the past or an earlier time
backwards and forwards
moving in both directions repeatedly
backwater
a place or situation that is stagnant.
backwoods
Remote, rural areas with few people.
backyard
An area behind a house.
bacon
Salted and cured pork meat.
bacterial
細菌的
bacterium
細菌
bad
morally wrong or harmful
bad actor
a person who behaves dishonestly.
bad apple
a person who negatively influences others
bad books
a state of disfavor
bad business
a situation causing problems or losses.
bad company
people who are a negative influence.
bad egg
a person who is dishonest or bad
bad hair day
A day when hair looks messy.
bad iron
poor quality metal or tool
bad joke
An attempt at humor that is not funny.