By midwinter, the snow is so deep 深冬时节积雪实在太深

154. The deeper the snow, the harder it is to detect prey,
     积雪越深越难发现猎物
155. and the rewards for the effort can be disappointing.
     努力捕食却往往空手而归
156. To say the least.
     这么说毫不夸张
157. By midwinter, the snow is so deep
     深冬时节积雪实在太深
158. that bobcats are forced to leave their territories
     山猫被迫离开他们的领地
159. to try and find easier hunting.
     寻找更易于捕捉的猎物
160. And this bobcat may be in luck.
     但这只山猫运气不错

来自《行星地球 第二季 第二集 Planet Earth S02E02 山脉》第 157 行