But once on level ground, they're vulnerable. 但回到平地上 他们就很容易遭到攻击

27. This is their first descent.
    这是他们第一次下山
28. One mistake could make it their last.
    一次失蹄就可能一命呜呼
29. Following the adults, the kids finally reach the valley.
    跟着成年羱羊 小羊们终于到达山谷
30. But once on level ground, they're vulnerable.
    但回到平地上 他们就很容易遭到攻击
31. Red foxes lie in wait.
    赤狐埋伏许久了
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

来自《行星地球 第二季 第二集 Planet Earth S02E02 山脉》第 30 行