To analyse preterm birth rates worldwide to assess the incidence of this public health problem, map the regional distribution of preterm births and gain insight into existing assessment strategies.
分析全球早产率从而评估这个公共健康问题的发生率，绘制早产区域分布图并了解现有的评估战略。
Based on the feature of modem submarine activity, analyse the existing problem, and discuss the development tendency of submarine rescue.
本文根据现代潜艇活动的特点，分析了目前潜艇救生存在的问题，对潜艇救生的发展趋势进行了探讨。
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