The most challenging part with this project is trying to build something inside a metal hull -- it's just really, really tight.
迪欧斯说：“最具挑战的部分是在一个金属壳内做文章，发挥的空间实在很小。”
Almost all cargo vessels, by contrast, have flat bottoms, which allow a larger volume to be kept buoyant for a given amount of hull metal.
相比之下，几乎所有商船的底部都是平的，因为这样可以为庞大的金属船壳提供更大的浮力。
The glass fiber reinforced plastic material can replace metal plates to produce the carriage body of a cargo train and the hull of a steamship.
该玻璃钢材料可以代替金属板材制造货运火车的车厢箱体、轮船的外 壳船体。
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