and the family will need to head out across the frozen sea before the mother's milk runs dry. 在母熊奶水干涸之前 一家人需要穿越冰封的海洋
A steep slope makes the best site for a den, 陡峭的斜坡是穴居的好地点
and its rays strike the Arctic more directly. 阳光逐渐直射到北极来
The polar bear cubs emerge from the den in which they were born. 小北极熊从洞穴中探出头来
Their mother stretches her legs after five months under the snow. 它们的母亲在雪下呆了5个月后终于可以出来伸伸腿
But the wolves need not risk injury today. 但是今天的这头狼不需要冒受伤的危险硬闯
A calf has been left behind in the panic. 它们在慌乱之中留下一头小牛
With each passing day, the sun climbs higher in the sky 随着时间一天天过去,天上的太阳升得越来越高
In the whiteout, the threat is almost impossible to detect, 在白茫茫的天气中 有危险也几乎不可能察觉到
but the musk oxen instinctively retreat to higher ground. 但是麝牛本能地向高地撤退