Satellite measurements of the icy surface of Antarctica have detected an active system of lakes under ice that is about one kilometer deep.

人造卫星的观测显示，南极洲的冰层下面有很多活水湖，深达一公里。

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The snowcapped peaks are Mount Griggs and (far right), part of an active system of ten volcanoes surrounding the valley, a hundred miles south of the proposed Pebble mine.

这两座山是建议开发的卵石矿南面一百英里的山谷周围十个活跃火山系统中的一个部分。

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It should be emphasized in energy utilization that passive system may have priority over active system because the former makes natural ventilation and lighting be fully used.

在能源利用上强调被动式系统优先于主动系统，因为被动式系统充分利用了自然通风与自然采光。

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An active glasses system requires electronic glasses that are wirelessly connected to the television.

VOA: special.2010.01.26

It requires no active cooling system and can be installed anywhere on earth, even an underground vault.

FORBES: UK Parliament Group to Study Thorium Reactors

This weapon, which is called the Active Denial System, has been developed by the Joint Non-Lethal Weapons Directorate, in collaboration with Raytheon.

ECONOMIST: Electromagnetic weapons

But when a vehicle-mounted Active Denial System was sent to Afghanistan in May 2010, it was eventually shipped back home without being used.

ECONOMIST: Electromagnetic weapons