But how to reach them? 但是怎样才能接近呢？

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
243. But how to reach them?
     但是怎样才能接近呢？
244. The adults encircle their young.
     成年象已经围成圈在保护小象
245. It's an impenetrable wall of grey.
     这堵灰色皮墙围得非常坚固 很难突破
246. A few exhausted stragglers are still arriving.
     还有一些筋疲力竭的落伍的大象赶了过来

来自《行星地球 第一季 第七集 Planet Earth S01E07 伟大草原》第 243 行