Operation mode can be divided into the upper and lower control and ground single control, but also point up point drop, multilayer control.

操作方式可分为上下控制和地面单人控制，也可点升点降、多层控制。

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Ford vowed that he would sooner burn his factory to the ground than build a single vehicle for war purposes.

福特起誓说，他宁愿把自己的工厂烧毁，也不为战争生产一辆汽车。

《柯林斯英汉双解大词典》

The mishap occurred when the single-engine aircraft was caught by a gust of wind while hovering a few feet above the ground before landing.

事故发生时，这架单引擎飞机正在离地几英尺的空中悬停准备降落，此时遇到了阵风。

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Inspite of several ground breaking studies on autism, there is no single treatment or cure, although experts say certain therapies and educational approaches reduce the challenges associated with the condition.

VOA: standard.2010.03.23

The catcher advanced to third after Yankees right fielder Brennan Boesch was charged with an error for letting Kelly Johnson's ground single go under his glove.

WSJ: Cobb has strong start as Rays beat Yankees 3-0

It also uses a tether and can stay aloft for 12-hours on a single ground-station battery, letting it spy from afar with on-board HD, night-vision and thermal cameras.

ENGADGET: CyPhy Works reveals tethered flying bots that can spy on you indefinitely (video)

Interestingly, Mr. Davis has cited the importance of layered or "tiered" defense among his rationales for restarting the canceled E2I secondary interceptor for the single ground-based defense site he advocates despite the fact that the E2I system does not represent an independent layer.

CENTERFORSECURITYPOLICY: Center for Security Policy | US Strategic Defense Program Is Too Important To Be Entrusted To Officials Who Would Eviscerate It