But building a tiny, lightweight flying robot is tough when you need a power supply — like an onboard battery — to keep the MAV flying.

然而研制这种微小、轻型的飞行器是很困难的，因为必须要有如板载电池这样的电源供电才能维持它的飞行。

youdao

THE Pelican, a small, remotely controlled helicopter drone weighing less than a kilogram, is powered by a battery that provides about 20 minutes’ flying.

Pelican 是一种重量不到一公斤，依靠电池供电可以飞行二十分钟的遥控直升机。

youdao

Isabel Fenton of West Springfield, Mass. was flying a Vega Ventura about 6,000 feet over the dunes off Camp Davis the other day, hauling an airplane target for a battery to shoot at.

有一天，来自麻省西春田市的女飞行员，在戴维营沙丘地上空6000英尺高的地方驾驶一架大型的维嘉文图拉飞机，后面拖载着一架标靶飞机让高射炮练习打靶。

youdao

WARSAW, Poland (AP) Polish national airline LOT said Tuesday its Boeing 787s, which had been grounded for months due to battery problems, will resume flying in June.

NPR: Poland's Boeing 787s To Resume Flight In June

Aviation authorities worldwide have ordered airlines to stop flying their Dreamliners because of the fire risk associated with battery failures aboard the highly touted aircraft.

CNN: NTSB: Faulty Dreamliner battery was not overcharged

So the more company officials explain what they have done to resolve battery issues on the Dreamliner, the more they awaken latent fears of flying that many passengers harbor.

FORBES: Boeing Completes Tests Leading To Resumption Of Dreamliner Operations