名词
中文翻译：第一年级
同义词：
['primary grade', 'elementary grade']
例句：
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1.She is in the first grade at school.
她在学校上一年级。
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2. The first graders are learning basic math skills.
一年级学生正在学习基本的数学技能。
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3. The teacher explained the first grade curriculum to us.
老师向我们解释了一年级的课程内容。