以下为句子列表：
英文: A low fertility rate and increased life expectancy are the main reasons behind the rapid aging.
中文: 出生率低和人的寿命的增长是造成加拿大人口老年化速度增快的主要原因。
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英文: A maverick U.S.-based fertility expert is due to launch an international search today for a woman willing to be the first surrogate mother for human cloned embryos.
中文: 美国一位个人生育科学家今天将发起一项世界范围内的搜寻，寻找一位女性自愿担当第一个人类科隆晶胚的代孕母亲。
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英文: A purposive sampling method was used to recruit 54 mothers attending an In Vitro Fertilization/Embryo Transfer and Tubal Embryo Transfer program at an infertility center in central Taiwan.
中文: 本研究采立意取样，样本来自于中部某不孕症研究中心接受胚胎植入成功怀孕的幼儿母亲，共收取54位个案。
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英文: A survey has been carried out of soil erosion in the black soil area at the east piedmont of the Great Xingan Mountains in Hulunbuir, by making use of satellite remote sensing data available and findings of the national survey of soil fertility and assess
中文: 摘要利用卫星遥感资料结合全国耕地地力调查与质量评价项目的实施，在内蒙古呼伦贝尔市大兴安岭东麓低山丘陵黑土区进行了土壤侵蚀现状调查研究，摸清了该地区土壤侵蚀现状。
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英文: “If you give the consumer piece of mind that their fertility will be restored, and that their hormones are not going to be affected, they may feel that it is safer to use this contraceptive.
中文: “只要你告诉消费者一点点关于他们的生育能力将能恢复而且他们的激素水平将不会受到影响的观点，他们就会觉得这个避孕药更安全。”
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