单词：knock rating
knock rating的用法和样例：
例句
- Another problem is that existing petrol engines cannot take advantage of the much higher octane rating.另外一个问题是现有的汽油引擎无法利用更高辛烷值的优势。
- However, if it knocks heavily under most driving conditions while you are using fuel with the recommended octane rating, see your authorized dealer to prevent any engine damage.可是，在使用推荐的辛烷值燃油时，要是在大部分行驶条件下爆震严重，请找你的福特授权经销商，避免任何对于发动机的损伤。
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