名词
中文翻译：水平
同义词：
['grade', 'rank', 'tier']
例句：
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1. The students are at different levels of English proficiency.
学生们的英语水平各不相同。
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2. The company has a hierarchy of managers and employees.
公司有一套经理和员工的层级体系。
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3. The team needs to level the playing field for all members.
团队需要为所有成员提供一个公平的竞争环境。