名词
中文翻译：水平
同义词：
['height', 'altitude', 'grade']
例句：
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1. The water level has risendue to the heavy rain.
由于大雨，水位上升了。
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2. The students are at differentlevels of proficiency in English.
学生们在英语熟练程度上各不相同。
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3. The mountainrange is divided into several levels by ariver.
山脉被一条河流分成了几个等级。