英文關鍵字
activity
adult
battle
big
board
boy
business
caucasian
challenge
checker
chess
chessboard
competition
concentration
curiosity
decision
discovery
diversity
education
fight
figure
fun
game
giant
group
intelligence
king
knight
large
learning
leisure
male
man
mature
move
outside
pawn
person
piece
play
player
queen
set
sport
strategy
thinking
white