名词
中文翻译：额外的覆盖物
同义词：
['additional cover', 'extra layer']
例句：
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1. We need to add an extra layer of protection for the new project.
我们需要为新项目增加一层额外的保护。
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2. The extra cover will protect the flowers from the rain.
额外的覆盖物将保护花朵免受雨水的侵害。
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3. She put on an extra cover to keep warm in the cold weather.
她在寒冷的天气里穿上了额外的衣物以保持温暖。