名词
中文翻译：氢指数
同义词：
['hydrogen content', 'hydrogen concentration例句：1. The hydrogen content in the water is high.（水中的氢含量很高。）']
例句：
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1. The hydrogen content in the water is high.
水中的氢含量很高。
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2.The hydrogen concentration in the air is decreasing.
空气中的氢浓度正在减少。
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3. The hydrogen content of the fuel is low, which affects its combustion efficiency.
燃料中的氢含量低，这影响了其燃烧效率。