They are just two months old 小熊才两个月大

176. It's spring and new life stirs.
     新的生命在春天的气息中开始蠢蠢欲动
177. 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
178. 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
179. They are just two months old
     小熊才两个月大
180. and instinctively follow her lead.
     本能地跟在母亲后面
181. A steep slope makes the best site for a den,
     陡峭的斜坡是穴居的好地点
182. but it's a tricky place to take your first steps.
     但第一次踏出脚时是不能掉以轻心的

来自《行星地球 第一季 第六集 Planet Earth S01E06 冰雪世界》第 179 行