He said that couples, gay and straight, who wanted fertility treatment were often worried about the effect on a child of knowing that they could track down their missing biological parent.
他说，寻求辅助生育治疗的伴侣，不管是同性恋还是异性恋，都很担心如果孩子知道自己能找回生父母会有什么后果。
The Nazca wanted land for corn and other crops and did not realise the forests were crucial to soil fertility and moisture, said the Cambridge University-led report.
剑桥大学主导的这个报告表示纳斯卡需要土地来种植玉米和其他作物，而并没有意识到森林对于保持土壤的养分和水分的重要性。
In cities and wealthier rural areas, surveys found that the number of babies women said they actually wanted would produce a fertility rate well below 1.47.
在城市和富裕的农村地区，调查发现与妇女们实际想要的孩子数量相应的生育率低于1.47。
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