Exhausted from his swim, the bear must regain his strength. 游得精疲力竭的北极熊必须恢复体力

242. There will be no easy meals on this island.
     在这座岛上找到吃的并不容易
243. Walruses are the largest seals in the world.
     海象是世界上最大的海豹科动物.
244. They weigh over a ton and are armed with tusks a metre long.
     体重超过1吨, 有长达1米的象牙为武器
245. Exhausted from his swim, the bear must regain his strength.
     游得精疲力竭的北极熊必须恢复体力
246. The next day, a sea fog shrouds the island.
     第二天海雾笼罩了这座岛屿
247. The walruses sense that they are in danger.
     海象已经意识到危险
248. Using the fog as cover, the bear approaches the herd.
     在海雾的掩护下,北极熊向海象群靠近

来自《行星地球 第一季 第六集 Planet Earth S01E06 冰雪世界》第 245 行