精算师职业要求主修精算研究或精算科学。

This occupation requires a major in Actuarial Studies or Actuarial Science.

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精算科学是研究对风险的管理及量化的专业。

Actuarial science is the study of quantifying and managing risk.

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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。

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.

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