Globally, the average life span is 71.4 years; for a few lucky people, it may exceed 100 years.

全世界人口的平均寿命是71.4岁，少部分幸运的人呢能够活到100多岁。

One reason the colonists married early was that their average life span was less than forty years.

殖民者早婚的原因之一是他们的平均寿命不到四十岁。

In 1993, the average life span of women was 6.9 years longer than that of men in the United States.

1993年，美国女性平均寿命比男性长6.9岁。

The new formula also lines up the average life span of a Lab (12 years) with the average 70-year human life span.

新公式还将实验室的平均寿命（12 年）与人类的平均寿命 70 年对齐。

Not only that, the average life span grew from about thirty to thirty-five years in the early  18th century to around forty to forty-five years in the early 20th century.

不仅如此，平均寿命从 18 世纪初的约 30 至 35 岁增长到 20 世纪初的约 40 至 45 岁。

Just as with other companion animals, it's important to do your homework before buying a hedgehog. Pet hedgehogs have an average life span of four to six years and weigh about a pound.

就像其他伴侣动物一样，在购买刺猬之前做好功课很重要。宠物刺猬的平均寿命为四到六年，重约一磅。