It's a 30-foot drop. 这有九米高

32. At the first sign of danger,
    一有危险迹象
33. the young ibex instinctively run back to steeper ground.
    羱羊幼仔便本能地奔回陡坡
34. But heading for this particular rocky outcrop could be a mistake.
    但爬上这块突出的岩石可能是个错误
35. It's a 30-foot drop.
    这有九米高
36. The fox has them trapped...
    赤狐把它们困住了
37. or so it seems.
    或者看起来是这样
38. This is what ibex were born to do.
    这正是羱羊与生俱来的本领

来自《行星地球 第二季 第二集 Planet Earth S02E02 山脉》第 35 行