These front-line defences are backed up by armoured units in reserve.前线的这些防御工事都得到了后备装甲部队的支援。Our patrols were frequently tasked to observe and report front-line positions.我们的侦察队频繁地接到任务去侦察和报告前线的位置。More front-line troops will be flown to the battle zone over the next few days.今后几天将会有更多的前线部队被调往交战区域。