以下为句子列表：
英文: Campaigns to promote sleeping on the back have cut the incidence of SIDS significantly.
中文: 提倡平躺着睡觉的运动已经极大地削减了患婴儿猝亡综合症的机率。
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英文: Phages usually have complex capsids (protein coats) composed of a polyhedral head, containing the nucleic acid (DNA or RNA), and a helical tail, through which nucleic acid is injected into the host.
中文: 噬菌体通常由复杂的衣壳组成一个多角体的头部，包含有核酸（DNA或RNA）和螺旋状的尾管，通过这个尾管核酸可以被注入寄主的体内。
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英文: They contain nitrogen and usually occur as salts of asids such as citric, malic, and succinic acids such as citric, malic, and succinic acids.
中文: 它们是一类含氮的，一般由酸性盐如柠檬酸，苹果酸，琥珀酸所形成。
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英文: Gamasids belong to genera and species and 9.9% were Laelaps echidninus;
中文: 革螨分 属 种 ,毒厉螨占 9.9%;
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英文: The virion are approximately 0 to 70 nm in diameter and has a bilaminal envelope, while the nucleo capsids are 90-0 nm.
中文: 该病毒粒子具有囊膜，完整的病毒粒子直径为 0—70nm，核衣壳直径为90—0nm。
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