barbican

/ˈbɑɹbɪkən/ 名词 C2

中文：瓮城、外堡、箭楼

A tower at the entrance to a castle or fortified town. · Near-synonym: guardhouse
A fortress at the end of a bridge.
An opening in the wall of a fortress through which the guns are levelled; a narrow loophole through which arrows and other missiles may be shot.
A temporary wooden tower built for defensive purposes.

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