名词短语
中文翻译：下降的年级
同义词：
['declining grade', 'declining level']
例句：
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1.The students' performance is gradually declining.
学生的表现在逐渐下降。
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2. The school has decided to implement a new system for the declining grades.
学校决定对成绩下降的学生实施新的制度。
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3. The economy is expected to experience a decline in the declining grades.
预计经济将经历在下降的级别上的下滑。