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: 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: In Japan and Hong Kong, as population density is intensive, there are few parking places for private cars.
中文: 由于人口密度高，日本和香港私人汽车停车位很少。
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英文: STUDIES BY HARGRAVE AND GEEN ESTIMATED NATURAL COMMUNITY GRAZ-ING RATES BY MEASURING FEEDING RATES OF INDIVIDUAL ZOOPLANKTON SPECIES IN THE LABORATORY AND THEN COMPUTING COMMUNITY GRAZING RATES FOR FIELD CONDITIONS USING THE KNOWN POPULATION DENSITY OF GR
中文: 由哈格雷夫(HARGRAVE)和吉恩(GEEN)所进行的研究，对自然条件下的群落食草比例进行了估计，其手段是通过测量出实验室内单独的浮游动物种类的结食比例，然后利用已知的食草动物种群密度，计算出实地状况下的群落食草比例。
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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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