Troops have been sent to protect aid workers against attack.
已经派出部队保护援助工作人员免遭袭击。
A line of forts was built along the border to protect the country against attack.
边界沿线构筑了碉堡，以防敌人进攻该国。
Like many countries China deploys ground-based air-defenses to protect against sudden air attack.
和许多的其它国家一样中国部署了地基的防空系统来抵御来自空中的突击。
A line of forts was built along the border, to protect the country against attack.
边境沿线均构筑了堡垒，以防外敌进攻。
The soldiers dug trenches to protect themselves against enemy fire or attack.
士兵们挖掘战壕来保护他们自己不受敌人的炮火或攻击。
The soldiers dug trenches to protect themselves against enemy fire or attack.
士兵们挖掘战壕来保护他们自己不受敌人的炮火或攻击。
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