短语讲解：

1. The study was based on mortality and population records from the Human Mortality Database.

base on 使建立在…基础上
例句："Base on Yunfu, orient to the world and aim at the future."
立足云浮,面向世界,走向未来。

2. They noted that some individuals born in the U.S., France, Japan and Britain lived to be at least 110 years old between 1968 and 2006.

at least 至少
例句：In fact it requires at least n generators.
事实上，它至少要有n个元素。

3. But then many of those individuals died a short time later, regardless of when they were born.

regardless of 不管， 不顾; 无; 不拘
例句：It takes in anybody regardless of religion, colour, or creed
任何人，不论宗教、肤色或信仰，都可以加入。

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