Even in cultures without access to mass media, the optimum waist-to-hip ratio for women is around 0.7, which corresponds most closely to an hourglass shape, and is linked to fertility.
即使在和大众传媒没有交集的文化中，女性腰围与臀围的最佳比例也是在0.7左右，近似于沙漏形状，并与生育有关。
When fertility is high and a country is young (median age below 20), there are huge numbers of children and the overall dependency ratio is high.
一个国家生育率高，表示这个国家很年轻（中位年龄在20岁以下），小孩数量庞大，依赖性比例相当高；
Scientists concluded that such a small ratio was considered good for a woman's health and resulted in high fertility.
科学家总结认为这样的比例对女性健康和生育有利。
The maximum nitrification ratio of fertilizer N in soil is up to 20%-42%, according to the soil fertility and rate of fertilizer N applied.
氮肥中N在土壤中的净硝化率最高达42％，因土壤肥力和施N量不同而异。
Compared with prior fertilization mode or device, the utility model has the advantages of saving labor and time, not hurting the seedlings and high fertility utilization ratio.
与现有追肥方法或装置相比，具有省工省时、不伤苗、肥力利用率高等优点。
Researchers say it is thought that a small waist-to-hip ratio is equated in the mind with good health and high fertility.
研究发现，小的腰臀比例往往给人一种身体健康和生育能力强的印象。
Researchers say it is thought that a small waist-to-hip ratio is equated in the mind with good health and high fertility.
研究发现，小的腰臀比例往往给人一种身体健康和生育能力强的印象。
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