adj.(人类的始祖)原人的
n.(人类的始祖)原人
Protohuman moms probably fashioned baby slings, too, they suggest, both for ease of transportation and to keep the young warm by holding them close to their bodies. 史前的母亲大概也使用背带，因为方便，而且孩子紧贴著母亲容易保持体温。
