以下为句子列表：
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: 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 generation is that
中文: 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: Wheat-maize rotation is one of the major double cropping systems, taking an important place in grain production in Shandong province, about 2.36 million ha accounting for 54.5% of the total cultivated acreage, producing 21.7 million tonnes grain, 57.9% of
中文: 小麦-玉米轮作是主要一年两作制之一，在山东省粮食生产中起重要作用，大约236万公顷，占总耕地面积的54.5%，生产2170万吨粮食，为1990年粮食总产的57.9%。
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