The cats are hungry and the elephants seem to sense it. 狮子十分饥饿 大象好像也感觉到了危机

236. In the darkness, the tables turn.
     在黑暗之中 局势发生了变化
237. The elephant's night vision is little better than our own.
     大象的夜视能力只比人类稍好一点
238. But lions have much more sensitive eyes.
     而狮子有着更加锐利的视力
239. The cats are hungry and the elephants seem to sense it.
     狮子十分饥饿 大象好像也感觉到了危机
240. Lions don't usually hunt elephants,
     狮子通常不会把大象当作捕杀对象
241. but desperate times require desperate measures.
     但到了走投无路之时也会铤而走险
242. This herd contains calves, easier targets.
     这一象群里有更容易下手的幼象

来自《行星地球 第一季 第七集 Planet Earth S01E07 伟大草原》第 239 行