perhaps for sheer joy. 也许只是因为高兴

27. After months of confinement underground
    长达数月的地下闭居已经结束
28. she toboggans down the slope.
    它从斜坡上一滑而下
29. Perhaps to clean her fur,
    也许是为了清洁皮毛
30. perhaps for sheer joy.
    也许只是因为高兴
31. Her cubs gaze out of their bright new world for the very first time.
    它的幼熊们第一次注视着 这个明亮的新世界
32. The female calls them,
    母熊召唤着熊崽
33. but this steep slope is not the easiest place to take your first steps.
    但在这个陡峭的斜坡上 踏出第一步可不太容易

来自《行星地球 第一季 第一集 Planet Earth S01E01 从北极到南极》第 30 行