名词
中文翻译：残余物
同义词：
['scrap', 'residue']
例句：
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1. The old wine has left a dreg of sediment in the bottom of the glass.
旧酒在玻璃底部留下了一丁点儿沉淀。
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2. After the rain, the river had left a dreg of silt on the banks.
雨后，河水在河岸上留下了一丁点儿淤泥。
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3. The cook used up all the ingredients and left a dreg of leftovers for the next meal.
厨师用完了所有食材，剩下了一些剩菜作为下一餐的配料。