The villagers are busy building defensive works.

村民们正忙着修防御工事。

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In the history of Chinese cities, a walled-city is not just a military castle but a settlement with defensive works.

在中国城市史上，城是指构筑了防御性设施的聚落，但它不等同于一般的军事城堡。

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The troops must take all measures to strengthen the positions occupied by them, arranging trenches and other defensive works.

各部必须采取一切手段巩固阵地，挖好战壕和准备#好其它防御工事。

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The Gwynedd Archaeological Trust says road works and a honeycomb of buildings were found, but no defensive ditches.

BBC: 'Important' Roman site found at Llanedwen, Anglesey

Xolair works by targeting an immune-system molecule called immunoglobulin E (IgE), a crucial defensive weapon that goes into overdrive in many patients with allergic asthma.

FORBES: Attacking Asthma, For A Price