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protohuman adj.古時類人猿的,早期原始人的。

protolithic

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 史前的母親大概也使用背帶,因為方便,而且孩子緊貼著母親容易保持體溫。