But with the improvement of living standard and the prolongation of average life-span the regulations gradually show their defects.

随着生活水平的提高，人均寿命的延长，这一规定逐渐显示出其弊端。

youdao

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

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

CNN: Commentary: A week with the heroes