要维持人口不变，每位育龄妇女就要抚养2.1个孩子(每位父母一方抚养的一位孩子不能生育，或者反过来说没有孩子，外加0.1个点补充年轻死亡的女性)。

For the population to stand still, each woman needs to have 2.1 children (one child per parent, plus an extra 0.1 to account for women who die young, are infertile, or otherwise do not have children).

youdao

她们的挑战是维持对伴侣的吸引力，好让他能留下并帮助抚养、保护孩子。

Their challenge was to continue to attract their partner so that he would stay and help to raise and protect the children.

youdao

在怀孕和分娩后，女儿们会和她们的母亲一起呆在被保护的环境中，抚养他们自己的孩子并维持部落境内的统治。

After conception and birth, daughters would stay with their mothers in the protected environment, to raise their own children and maintain dominance over their clan's territory.

youdao