translation.en: Another traditional usefulness of older people is that they are capable of babysitting their grandchildren, thereby freeing up their own adult children, the parents of those grandchildren, to go hunting and gathering food for the grandchildren.
translation.zh: 另一种老年人的传统用处， 是他们有能力帮忙照看 他们的孙辈， 从而让其成年子女， 那些孙子们的父母， 去狩猎和采集食物给孙子们。