What Makes Humans Special

HALLMARK TRAITS of the human body did not all arise anew in our species.
anew: 改めて、新たに

Instead they emerged piecemeal in our forebears over millions of years.
piecemeal: ひとつずつ、少しずつ、漸次に

Many of these traits seem to have helped support two defining trends in our evolution: upright locomotion and tool use.
forebears: forebearの複数形。先祖

More on this topic:Our Secret Evolutionary Weapon: MonogamyWhy Humans and Other Primates CooperateWhat Makes Humans Different Than Any Other Species