But even now blizzards can strike without warning. 但即使是现在 暴风雪 仍会在毫无征兆的情况下来袭

48. and the cubs must have the shelter of the den.
    熊崽们必须回到洞中避寒
49. It's six days since the bears emerged
    现在是北极熊现身后的第6天
50. and spring is advancing rapidly.
    春色匆匆
51. But even now blizzards can strike without warning.
    但即使是现在 暴风雪 仍会在毫无征兆的情况下来袭
52. Being so small, the cubs are easily chilled and they will be more comfortable resting in the den.
    幼小的熊崽很容易冻僵 躲在洞穴中可能会更舒服些
53. But their mother must keep them out and active.
    可是母熊必须得把它们带到外边活动
54. She's becoming weak from hunger
    饥饿将它折磨得虚弱不堪

来自《行星地球 第一季 第一集 Planet Earth S01E01 从北极到南极》第 51 行