他们说，它有一天可能取代美国航空航天局的航天飞机，向国际空间站运送宇航员和多达12吨的货物。
They say it could one day replace NASA's Space Shuttle to transport up to 12 tonnes of cargo and astronauts to the International Space Station.
一年当中的每一天，大型的货船驶入全球各个港口，但几乎没机会被我们这些天天依赖其运送的货物的人注意到。
Every day of the year, in ports all over the world, vast cargo ships sail in, unnoticed by almost all of us who rely on their merchandise.
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