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densities

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The densities of different substances vary greatly. (不同物质的密度差异很大。)
Population densities in urban areas are generally high. (城市地区的人口密度通常很高。)
The densities of these materials are crucial for this experiment. (这些材料的密度对这个实验至关重要。)
We measured the densities of the samples. (我们测量了样本的密度。)
The densities of gases can be affected by temperature and pressure. (气体的密度会受到温度和压力的影响。)
High densities of buildings are common in big cities. (高楼大厦的密集在大城市很常见。)
The densities of these solutions need to be adjusted. (这些溶液的密度需要调整。)
Low densities of certain species may indicate environmental problems. (某些物种的低密度可能表明存在环境问题。)
The densities of the two liquids are different. (这两种液体的密度不同。)
Scientists are studying the densities of celestial bodies. (科学家们正在研究天体的密度。)

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