and they're only just in time, 它们刚好赶得及

61. They've grown enormously in confidence,
    它们的信心日益膨胀
62. but they don't have their mother's sense of urgency.
    不过它们并不像母熊那样着急
63. At last it seems that they're ready for their journey
    最后 它们似乎做好了旅行的准备
64. and they're only just in time,
    它们刚好赶得及
65. for a few miles from the coast the ice is already splitting.
    离岸几英里远的海面上 冰层已经开始崩裂
66. Now the mother can start hunting for the seals they must have,
    现在母熊将猎杀海豹 获取紧需的食物
67. but she's leading her cubs into a dangerous new world.
    而它也正带着熊崽们 进入一个危险的新世界

来自《行星地球 第一季 第一集 Planet Earth S01E01 从北极到南极》第 64 行