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。

Residents have the responsibility of being the first line of defence against wildfires.

居民有责任成为野火的首要防卫人员。

Despite anything the science of medicine may have achieved, the immune system is our main defence against disease.

不管医疗科学已取得了什么样的进步，免疫系统仍是我们抵抗疾病的主要防御手段。

Lacking leadership, they could organize no defence against their oppressors.

没有人领导，他们就无法组织起来反抗压迫者。

There can be no real defence against attacks from the air.

对来自空中的攻击是无法设防的。

Defence against these threats enhances our collective security.

防范这些威胁将加强我们的集体安全。

Bundling provides incumbent operators with another defence against VoIP.

捆绑销售是主体运营商对付网络语音技术的另一防御手段。

Healthy eating and lifestyle habits are a strong defence against the disease.

健康的饮食和生活习惯是防御该疾病的利器。

The posterior hypothalamus performs the function of defence against cold.

下丘脑后部执行着抵御寒冷的功能。

In particular, they hope to break down the collective defence against antibiotics.

换而言之，化学家们希望打破病原体针对抗生素的联合防御。

Tighter fiscal policy is Brazil's best defence against short-term economic trouble.

更紧缩的财政政策是巴西一直短期经济问题的最佳途径。

Forts were framed for defence against land or sea forces, but useless against an air attack.

建筑城堡是为了防御陆海军入侵，但对于空中打击就无效了。

His services were sometimes retained by companies as a defence against those corporate raiders.

他的服务有时还会被企业保留下来，用以防备那些企业掠夺者。

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。

Suncream may actually block the body's natural defence against harmful UV rays, a surprising new study has found.

据英国《每日邮报》11月4日报道，一项令人惊奇的新研究发现防晒霜实际上可能会阻碍人体对紫外线的自我防御。

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。

Finally, use international instruments to strengthen collective defence against health threats that respect no borders.

最后，通过国际文书加强对不受边界限制的健康威胁的集体防范。

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。

Indeed, what does the very term defence signify in connection with the neuropsychoses, if it is not a defence against what?

的确，有关神经变态狂患者，防卫这个术语的意涵是什麽？难道不就是对抗什麽的防卫？

This can render powerful antibiotics, which are often the last defence against multi-resistant strains of bacteria, ineffective.

这一情况可使强力抗菌素失效，而强力抗菌素常常是针对耐多药菌株的最后一道防线。

These ashigaru are armed with long spears for use in close combat or to make an almost-impenetrable defence against cavalry.

这些足轻配备了超长矛，既可用于近战，也可用来组成一道几乎无法逾越的枪墙以抵抗骑兵。

Many activities undertaken to prepare for an influenza pandemic are improving our collective defence against other outbreaks.

为防备流感大流行开展的众多活动正在改进我们对其它疾病暴发的集体抵御能力。

Is scientific scholarship perhaps only a fear and an excuse in the face of pessimism, a delicate self-defence against-the Truth?

科学知识可能只是对悲观主义的一种恐惧和借口？是针对真理的微妙的自卫方式？

Greedy acquisition, for example, can be a defence against being aware of envy of those who have, or are, what one wishes for oneself.

举个例子，贪婪，可能是对意识到嫉羡那些拥有的人时的防御，或意识到自己渴望成为那样的人时感到嫉羡时的防御。

International health security is the first line of defence against health shocks that can devastate people, societies and economies worldwide.

国际卫生安全是针对在全世界范围可使人类、社会和经济遭受严重破坏的健康风险冲击提供的第一道防线。

But it believes its best defence against rising costs is to go on the attack, with products and marketing that are better suited to leaner times.

但是他们相信应对成本上升最好的防守就是进攻——使产品和市场与现在萧条的时期相称。

Normally, trees are the best defence against pollution; but when it's too hot outside, the trees' own self-defence mechanism may actually make things worse.

正常情况下，树木是抵御污染的最佳卫士，但是当外界温度过高时，树木自身的防御机制实际上可能会令污染状况恶化。