名词
中文翻译：密度
同义词：
['dense', 'compact', 'densely packed']
例句：
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1. The soil is very dense, making it difficult to dig a hole.
土壤非常密集，很难挖出一个洞。
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2. The forest is densely packed with trees, making it hard to see through.
森林里树木密集，看不清楚。
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3. The liquid is very dense, making it difficult to mix.
液体非常浓稠，难以混合。