名词
中文翻译：无直接对应中文翻译
同义词：
['octane number decrease', 'octane number drop', 'octane rating drop']
例句：
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1. The car's performance has significantly decreased since the engine was modified.
自从引擎被修改后，汽车的性能显著下降。
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2. The fuel quality has dropped due to contamination during transportation.
由于运输过程中的污染，燃料质量已经下降。
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3. The manufacturer has announced a recall for vehicles with this issue.
制造商已宣布召回存在此问题的车辆。