以下为句子列表：
英文: A recent survey revealed that the population density in the metropolis was decreasing.
中文: 最近一次调查显示，都会区的人口密度正在降低。
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英文: Abstract: Non-spot pollution source was analyzed qualitively and quantitatively on the basis of experiment data of pollution density variation during raining and flood process.The experiment result is in agreement with the observed reality.A calculation m
中文: 文摘:利用雨洪过程中污染物浓度变化的试验资料，对非点源污染进行了定量和定性分析，指出非点源在雨洪过程中的作用特点与试验成果有很好的一致性，提出了一种粗略测算次雨洪非点源量值的方法。
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英文: Abstract: The investigation of summer migration of rice water weevil Lissorhoptrus oryzophilus Kuschel in double cropping rice area of Zhejiang Province in 1994 and 1995 indicated that the main cause of its always low population density in second generati
中文: 文摘:研究表明，浙江省双季稻区稻水象甲二代虫量低的首要原因是绝大部分一代成虫迁出早稻田夏蛰并越冬，构成二代虫源的比例极微。
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英文: Basically like “adaptive approach”, the method can control triangulation density with respect to the change of normal curvature of the surface generating a small number of triangular facets, and thiny triangles, degenerate triangles and “cracks” in 3D spa
中文: 该方法基本上可以像“自适应”方法一样，根据曲面的法曲率变化来控制三角化剖分的密度，生成的三角片数量较少，并且可以避免在三维空间产生狭长的三角形、退化三角形与“裂缝”，运行速度明显比自适应方法快。
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英文: A Research on the Population Density of East Asia Pincers Scorpion
中文: 东亚钳蝎种群密度的研究
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