The National Weather Service rated the tornado an EF-5. That is the most powerful kind of storm on the five-level scale that measures a tornado's power.
美国国家天气局将这次龙卷风评定为EF-5级。用来评定龙卷风破坏力的系统共分为五级，EF-5是最高级别。
| 单词 | Service rate |
| 释义 |
Service rate
原声例句
VOA Special 2013年5月合集 The National Weather Service rated the tornado an EF-5. That is the most powerful kind of storm on the five-level scale that measures a tornado's power. 美国国家天气局将这次龙卷风评定为EF-5级。用来评定龙卷风破坏力的系统共分为五级，EF-5是最高级别。
英语百科
Service level（重定向自Service rate）
Service level measures the performance of a system. Certain goals are defined and the service level gives the percentage to which those goals should be achieved. Fill rate is different from service level. Examples of service level: |
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