But campaigners question the relevance of data on premature babies, many of whom are premature precisely because they, or their mothers, are ill.
2
同居小鼠成活率较高的原因，在研究人员对比了中风小鼠的脑组织后被证实。
The reasons for the higher survival rate for the socially housed mice were evident when the researchers compared brain tissues of mice after the stroke.
3
本文通过对部分仔貂死亡原因的分析，提出了提高仔貂成活率的措施。
This article through to the young mink cause of death analysis, comprehensively elaborated enhanced the young mink survival rate the measure.
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