These front-line defences are backed up by armoured units in reserve.

前线防御有后备装甲部队的支援。

The democracies of the West may find it hard to shore up their defences.

西方的民主国家可能发现很难加固自己的防御。

The harbour's sea defences are in poor condition.

港口的海防工事状况很差。

He emphasized the need to maintain Britain's defences at a level sufficient to deal with the unexpected.

他强调需要将英国的防卫力量维持在足以应付突发事件的水平。

They appeared in court not to raise defences, but to challenge the court jurisdiction.

他们来法院不是应诉，而是抗辩。