cas‧tle W3 / kɑs ə l $ kæ- / 名词 [可数名词]

1 ( also Castle ) a very large strong building, built in the past as a safe place that could be easily defended against attack :

Edinburgh Castle

a ruined castle

2 one of the pieces used in a game of chess . Each player has two castles, which start the game in the corner squares, and can move only forwards or sideways. 同义词 rook

3 castles in the air plans or hopes that you have that are unlikely ever to become real