Average life span in the wild: 70 years.

在野生环境中的平均寿命：70年。

youdao

Average life span in the wild: 45 to 50 years.

野生时的平均寿命：45 ~ 50年。

youdao

Compare this with an average life span of 52 in 1960, or of about 30 in 1900.

把这个数字与1960年的平均寿命52岁相比，又或者与1900年的人均30岁寿命相比。

youdao

It is true: many beneficial new therapies have extended the average life span and have driven a lot of the rise in costs.

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There is a high mortality rate -- with an average life span of only 47 -- minimal infrastructure and limited tools for economic development.

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That roughly means there's a 50% chance she'll live that long (roughly, because the median life span is not necessarily the average life span).

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