birds had become the last remaining branch of the dinosaur family tree. 鸟类成为恐龙族谱中仅存的一支
means this branch of dinosaurs, the theropods, 意味着恐龙的这个分支兽脚
but are their own unique branch. 但自成一个独特的分支
This leopard climbs up to a branch nine metres above the ground. 这只豹子爬到9米高的树枝上
unable to reach any other branch. 够不到其它的树枝
A bare branch is quite enough. 一根光秃秃的树枝就足够了