0ne out of every two cubs do not survive their first year out on the ice. 两只幼熊中往往会有一只无法在第一年存活下来

189. in this dangerous world of ice.
     要保护好自己的幼仔 母熊必须施展出所有的本领
190. The annual melt has begun.
     每年一次的解冻期来了
191. This is a challenging time for the bear family.
     对于北极熊一家来说 这是一个极富挑战性的时刻
192. 0ne out of every two cubs do not survive their first year out on the ice.
     两只幼熊中往往会有一只无法在第一年存活下来
193. As the sun's influence increases, the sea ice seems to take on a life of its own.
     随着太阳的威力逐渐增强, 海冰仿佛有了自己的生命
194. Glacial melt waters pour from the land, mingling with the sea
     融化了的冰川水从陆地上喷泻而出
195. and speeding up the thaw.
     与海水交汇 加速了解冻

来自《行星地球 第一季 第六集 Planet Earth S01E06 冰雪世界》第 192 行