名词
中文翻译：副级
同义词：
['subordinate grade', 'lower grade']
例句：
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1.The subgrade level of the course is very challenging.
这门课程的初级阶段非常具有挑战性。
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2. The students in the lower grades are still learning basic skills.
低年级的学生仍在学习基本技能。
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3. The subgrade level of the exam is quite difficult.
考试的初级水平相当难。