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....
Prune rambling roses when the flowers have faded.花朵凋谢后要剪除杂生的玫瑰枝。When should you prune apple trees?苹果树应该什么时候剪枝？Can you tell me whether it is a good thing to prune an apple tree?你能否告诉我该不该修剪苹果树？...