The UK Government's target is completely sustainable flying by 2050, but researchers found that more than half of all British farmland would be needed to grow the plants to make the biofuel.

英国政府目标是到 2050 年实现完全可持续飞行，但研究人员发现，要种植制造生物燃植物，需要英国一半以上农田。

She said Tuesday's flight shows a sustainable flight is possible, but the difficulty is in producing enough of the new fuel " so that we're flying more sustainable aviation fuel every day."

她说，周二飞行表明可持续飞行是可，但困难在于生产足够新燃，“以便我们每天都使用更可持续航空燃”。

See, this is why I don't leave the house because some unknown flying reptile bird creature could just swoop down and pluck out my eye. Ca-caw!

看吧，这就是我为什么不喜欢离开屋子，因为一些未知可飞行爬行生物可会俯冲而下然后拔出我眼球。嘎嘎。

NASA has a program looking at sustainable fuels for supersonic flight, because that's going to be another requirement to truly make it a viable option in the future.

美国国家航空航天局有一个研究超音速飞行可持续燃目，因为这将是未来真正实现超音速飞行另一个必要条件。

It can also provide clues about what is causing bee colonies to collapse, and monitor the inevitable march of climate change.

可飞行传感器可以提供线索，让人了解蜂群为何崩溃紊乱，同时也监测来势汹汹气候变化进行到了什么程度。

Experts say it's partly to see how far the weapons can fly and what they're capable of.

专家认为，部分原因是要测试一下导弹可飞行距离和导弹力。

OK. So, scientists criticised this plan to fly more sustainably.

好。因此，科家们批评了这个更可持续飞行计划。

Some suggest that the elusive animal is therefore not a bird at all, but a flying reptile unknown to science.

因此，一些人认为这种难以捉摸生物根本就不是鸟类，而是科无法明白可飞行爬行生物。

It succeeded, and now the Crew Dragon is the first vehicle that NASA has certified to carry humans since the Space Shuttle — and the first private spacecraft ever to receive that designation.

现在 Crew Dragon 是 NASA 自航天飞机以来第一个经认证可载人飞行器， 也是有史以来第一个获得该称号私人航天器。