and the whales will soon be forced north as winter returns. 很快冬季又到了 这些鲸鱼将不得不前往北方

65. The krill becomes concentrated as the spiralling net of bubbles draws inwards.
    螺旋型的气泡网逐渐收紧,把磷虾聚在一起
66. The team of whales work round the clock for the boom is short-lived.
    时光短暂,座头鲸昼夜不停捕食
67. Summer is already fading
    短暂的夏天正逐渐消失
68. and the whales will soon be forced north as winter returns.
    很快冬季又到了 这些鲸鱼将不得不前往北方
69. The sun's influence diminishes
    太阳的威力逐渐减弱
70. and the ocean starts to freeze.
    海洋开始结冰
71. The greatest seasonal change on our planet is underway.
    我们这个行星上最显著的季节变化正在发生

来自《行星地球 第一季 第六集 Planet Earth S01E06 冰雪世界》第 68 行