By employing the gaseous oxygen as oxidizer and gaseous hydrogen as fuel, hot-firing tests were performed for aerospike nozzle and dual-bell nozzle test engines with altitude compensating features.
2
当美国还拥有充足的能生产氢的煤炭和天然气的供应时，有什么理由不喜欢它呢？
As America has abundant supplies of coal and natural gas from which hydrogen can be made, what's not to like about it?
3
即使使用来自天然气的氢，它在城市驾驶的留有富裕的碳排放也仅有30克/公里。
Even using hydrogen derived from natural gas, its well-to-wheel carbon emissions for urban driving are only 30 grams/km.
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