动词
中文翻译：降级
同义词：
['degrade', 'diminish']
例句：
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1. The company has decided to downgrade its product line.
该公司决定降低其产品线。
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2. The economy is expected to downgrade in the coming months.
预计经济在未来几个月将下降。
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3.The quality of the product has been downgraded due to the defective parts.
由于缺陷部件，产品质量已被降级。