1·The town walls were built as a defence against enemy attacks.
城墙是为防御敌人袭击而修建的。
—— 《牛津词典》
2·Disease is also a risk, as members of tribal groups that have been contacted in the past have died of illnesses that they have no defence against, ranging from chicken pox to the common cold.
疾病也是一个危机，正如过去曾经接触过的，都已经死于疾病的其他部落的成员一样，他们没有任何的疾病防御，从水痘到普通的感冒都一样。
3·Strangely, she felt this awful feeling each time Ron spoke about the Defence Against the Dark Arts teacher.
可奇怪的是，每次罗恩提起这位黑魔法防御术老师，她就会感到这种恶劣的情绪。
4·Well, not until a certain git by the name of Lockhart took over as Defence Against the Dark Arts teacher, at any rate.
呵呵，直到有天有个叫洛哈特的饭桶当了黑魔法防御术老师，情况就不同啦。
5·You know, we'd really like to read the job adverts that Hogwarts publishes for the Defence Against The Dark Arts teaching post.
如你所知，大家都很乐意去拜读下霍格沃茨黑魔法防御术教授的招聘广告。