For years, the United States has led the global drone market. It is known to use UAV, or unmanned aerial vehicle, strikes against foreign targets.

多年来，美国一直在全球无人机市场中处于主导地位。众所周知，美国使用无人机袭击外国目标。

But the incident raised security concerns about the presence of drones, and potentially vulnerable areas just as the use of unmanned aerial vehicles was taking off.

但这起事件引发了人们对无人机和潜在易受攻击地区的安全担忧，当时无人机的使用正在兴起。

But the incident raised concerns about the security challenges of drones and potentially vulnerable areas as the use of these unmanned aerial vehicles was just taking off.

但这一事件引发了人们对无人机安全性担忧，那时无人机的使用刚刚起步。

An American Reaper drone was struck by a Russian fighter jet over international waters in the Black Sea, causing the Americans to down their unmanned aerial vehicle.

一架美国“死神”无人机在黑海国际水域上空被一架俄罗斯战斗机击中，导致美方使他们的无人机坠落水中。

On March 27, 2014, Facebook bought a company specialising in high altitude unmanned aerial vehicles.

2014年3月27日，Facebook收购了一家专门从事高空无人机的公司。

In a recent three-way tie-up, Optomec worked with Aurora Flight Sciences, an American producer of unmanned aerial vehicles, and Stratasys, a 3D-printing company based in Minneapolis, to make a smart wing for a small drone.

在最近一个三方合作中，Optomec公司与极光飞行科学公司-一家制造无人空中飞行器的美国公司，以及Stratasys公司-一家位于明尼阿波里斯市的3D打印公司，合力为小型无人机打造智能机翼。

We're talking about an unmanned aerial vehicle, a small plane that flies without a pilot to an airport in one of the Orkney Islands where a human postal worker would then get its cargo and deliver it to houses.

而是无人驾驶飞行器，它是一种小型飞机，可以在没有飞行员的情况下飞到奥克尼群岛的一个机场，到了那里再由邮递员取货然后送货上门。

It would use unmanned aerial vehicles to bring food from a taqueria chain and items from a drugstore company to people who live in a rural community near the Australian capital.

它将使用无人驾驶飞行器将快餐店连锁店的食物和药店公司的物品运送给居住在澳大利亚首都附近农村社区的人们。

" The elephants usually come out for food at about 5 pm, and return to the woods around 8 or 9 am the next day, " said Peng as he flew an unmanned aerial vehicle close to the elephants, filming and photographing them.

“大象通常在下午 5 点左右出来觅食，第二天早上 8 点或 9 点左右返回树林，”彭说，他操作无人机靠近大象，给它们录像和拍照。

The agronomist has just flown over the field with a hybrid unmanned aerial vehicle (UAV) that takes off and lands using propellers yet maintains distance and speed for scanning vast hectares of land through the use of its fixed wings.

这位农艺师刚刚驾驶混合动力无人机 (UAV) 飞过田野， 该无人机使用螺旋桨起飞和降落， 同时通过固定机翼保持距离和速度扫描大片土地。