As dawn approaches, squid and fish and plankton retreat downwards, to shelter in the darkness. 黎明来临, 鱿鱼,鱼和浮游生物再次下沉隐没在黑暗中
and the dolphins block the baitball's retreat. 海豚们锁定了从海面撤退的鱼群
but the musk oxen instinctively retreat to higher ground. 但是麝牛本能地向高地撤退
It causes the ice to advance and retreat every year. 使得冰盖面积每年都在扩大和缩小
For these fish the caves are a night time retreat, 对于这些鱼来说 洞穴是理想的过夜场所