One guard tried to close a barrier that had been pushed open, but it was too late.
一个边防兵试图合上被推开的路障，但是太晚了。
Under the plan, 120 federal police kept a 24-hour guard on a small commercial area close to the border.
根据该计划，120名联邦警察24小时守卫在靠近边界的一小块商业区。
Companies have long kept a close eye on employees to maintain productivity and guard against theft.
一直以来，公司都时刻提防员工顺手牵羊，并监督他们保持工作效率。
We must guard against inaccurate and ineffective theories, however, that suppose that distant engagement can supplant the decisiveness of close combat.
但是我们也要警惕错误的、无用的理论，即认为远程作战能够取代近距离作战的决定性地位。
Under the plan, 120 federal police kept a 24-hour guard on a small commercial area close to the border. Checkpoints were positioned every 500m to inspect cars and keep an eye on racketeers.
这项计划调动了120位联邦警察对边境旁边的一小块商业区进行24小时全天候的守卫，每隔500米就有一个岗哨检查过往车辆并密切注意诈骗团伙。
Under the plan, 120 federal police kept a 24-hour guard on a small commercial area close to the border. Checkpoints were positioned every 500m to inspect cars and keep an eye on racketeers.
这项计划调动了120位联邦警察对边境旁边的一小块商业区进行24小时全天候的守卫，每隔500米就有一个岗哨检查过往车辆并密切注意诈骗团伙。
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