Army officers discovered that the wrist watch was most practical for active combat.

军官们发现，腕表在战斗中最实用。

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“At Fort Rucker, for example, every combat aviation brigade that goes into theater, whether it is guard, reserve or active, comes through the aviation training exercise at Fort Rucker,” he said.

例如，在拉克堡，每个作战航空兵旅都要进入战区，无论是警卫，预备队或主动的，都要是通过航空训练演习。

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Keeping the brain active and engaged appears to combat the cognitive decline associated with getting older.

保持大脑的灵活和集中看来要与随着年纪增大产生的认知降低做斗争。

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"Crossing the threshold to active combat was an important psychological moment, " Dr Stelzenmueller said.

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In the jihad in the way of Allah, active combat is not always the role on the battlefield, nor can everyone fight in the front line.

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The United States has been committed to the defense of freedom in South Korea for decades--since the end of active combat on the Korean peninsula in 1953.

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