Children born into landless, and hence poor, families suffered reduced marital prospects, lower probability of reproduction, and higher infant mortality.

根据这个研究小组公布在《生态学》杂志上的研究结果，在没有土地的贫困家庭出生的儿童往往都经受了婚姻前景黯淡、生育率低下、新生儿死亡率高等痛苦。

youdao

So, they started to do collecting of data on mortality and they developed something called actuarial science, which is estimating the probability of people living.

所以，他们开始收集死亡率数据，并形成了叫精算学的科学，用来预测人们的寿命的概率。

youdao

The patients with cirrhosis or severe chronic hepatitis have higher nosocomial infectious probability. They have unfavourable prognosis and higher mortality.

结论肝硬化、重度慢性肝炎患者是医院感染的高发人群，预后差，死亡率高。

youdao

So, they started to do collecting of data on mortality and they developed something called actuarial science, which is estimating the probability of people living.

他们开始收集死亡率的数据,并且发展出精算学,用来估算人在各年龄段死亡的概率

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