After refuelling at Bangkok, they flew on to Singapore.

在曼谷加油后，他们飞往新加坡。

But they are the size of light aircraft and need considerable supporting infrastructure, such as runways and refuelling facilities.

但它们的大小相当于轻型飞机，需要相当多的配套基础设施，如跑道和加油设施。

And refuelling it is a bit of a pain.

而且加油有点痛苦。

Eventually, says NASA, the Moon could become a refuelling stop for human missions farther into the Solar System.

美国宇航局表示，月球最终可能成为人类探索太阳系更深处任务的燃料补给站。

As a result, they will probably have to remain at least 1,000km away from shore, a distance that their warplanes cannot cross without refuelling.

因此，他们可能不得不在离岸至少1000公里的地方停留，这是他们的战机不加燃料就无法跨越的距离。

Earlier plans by Airbus to make planes in America were thwarted when Boeing beat it to win a large order for mid-air refuelling tankers from the Pentagon.

波音公司曾挫败了空客早期在美国造飞机的计划，并从国防部赢得一笔很大的空中加油飞机的订单。