由四英里长的城墙围着的设防城镇a fortress town enclosed by four miles of ramparts对来自空中的攻击是无法设防的.There can be no real defence against attacks from the air.他们不能让这座城市不设防.They could not leave the city unguarded....

“设防”的拼音为：shè fáng...

“设防”的英语可以翻译为：set up defences，fortify，garrison ...