名词
中文翻译：氢
同义词：
['hydrogen-to-metal ratio', 'hydrogen-to-metal content']
例句：
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1. The ratio ofhydrogen to metal in the fuel is critical for its performance.
燃料中氢与金属的比例对其性能至关重要。
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2. The ratio of hydrogen to oxygen in the air is 2:1.
空气中氢与氧的比例是2:1。
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3. The ratio of hydrogen to oxygen in the atmosphere is crucial for life on Earth.
大气中氢与氧的比例对于地球上的生命至关重要。