形容词
中文翻译：Unknown
同义词：
['subordinate', 'secondary', 'tertiary']
例句：
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1.The second-grade students are preparing for the upcoming exams.
二年级的学生正在为即将到来的考试做准备。
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2. The secondary school offers a variety of extracurricular activities.
这所中学提供各种课外活动。
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3.The secondary market is where people buy used goods.
次级市场是人们购买二手商品的地方。