名词
中文翻译：上垫
同义词：
['upper support', 'upper cushion']
例句：
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1.The upper bolster of the chair is worn out.
椅子的上垫磨损了。
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2.The upper bolster of the sofa is soft and comfortable.
沙发的上垫柔软舒适。
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3.The upper bolster of the bed is designed to provide extra comfort.
床的上垫设计用来提供额外的舒适。