A pilotless plane must also be able to act autonomously in an emergency .

无人驾驶飞机也必须能够在紧急的时候采取自主行动。

First , a wholly automatic pilotless airliner would have to be built and shown to be safe .

首先，需要建造一架安全的全自动的无人驾驶客机。

Police around the world are keen to use small pilotless aircraft to help them nab fleeing criminals and monitor crime scenes from above .

全世界的警察都想要使用小型无人驾驶机帮助他们逮捕正在逃跑的罪犯以及监视上述犯罪现象。

Pilotless aircraft are now widely used by the armed forces , but those drones fly only in restricted airspace and conflict zones .

无人驾驶飞机现在在军事上被广泛应用，但是那些飞机只在空中禁区和纷争地带飞行。

The majority of pilotless planes that civilian agencies have their eyes on are little bigger than model aircraft and weigh much the same .

民间机构关注的大部分无人驾驶机都是重量大体一样、体积比模型机稍大一点的无人机。