国际空间站甚至也可以试运行合作,但阻碍仍存在。
The International Space Station could even be tapped for trial runs, though obstacles remain.
钼及其合金在高温下具有较高的力学性能,但阻碍其广泛应用的关键是高温氧化问题。
Molybdenum and its alloys has high mechanics performance, but the key problem that extensive application is blocked in high temperature environment.
它们提高了可买卖的商品的产量,但阻碍了它们被消费出去,这就是为什么生产者要寻找海外的购买者了。
They encourage the production of tradable goods, but discourage their consumption-which is why producers look for buyers abroad.
All tended to hinder technological innovation in those societies.
但都阻碍了 社会技术革新的趋势
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