名词
中文翻译：瓦砾屋顶
同义词：
['brick-and-mortar roofing', 'concrete shingles', 'asphalt shingles']
例句：
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1. The oldhouse had a felt-and-gravel roof that was in need of repair.
这所老房子有一个需要修理的瓦砾屋顶。
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2. The new apartment building has a modern feel-and-gravel roofing system.
这座新建的公寓楼采用了现代的瓦砾屋顶系统。
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3. The contractor replaced the old felt-and-gravel roof with a new one to improve energy efficiency.
承包商更换了旧的瓦砾屋顶，以提高能源效率。