前线防御有后备装甲部队的支援。
These front-line defences are backed up by armoured units in reserve.
刚一到达前线，他们就开始研究防御工事。
On arriving at the front they began to study the defense works.
爆炸发生在阿富汗与巴基斯坦接壤的东南边境Khost省一个防御牢固的名叫查普曼前线工作基地（Forward OperatingBase Chapman）。
The bombing took place inside Forward Operating Base Chapman, a well-fortified compound in Khost province near the southeastern border with Pakistan.
爆炸发生在阿富汗与巴基斯坦接壤的东南边境Khost省一个防御牢固的名叫查普曼前线工作基地（Forward OperatingBase Chapman）。
The bombing took place inside Forward Operating Base Chapman, a well-fortified compound in Khost province near the southeastern border with Pakistan.
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