He makes sure it's clear before crossing 雄性首领要确保迟缓的家族成员

256. has cut through their territory.
     横贯黑猩猩群的领地
257. The alpha male is cautious.
     雄性首领十分谨慎
258. His own mother was killed on this road.
     它的母亲正是在这条公路上丢掉了性命
259. He makes sure it's clear before crossing
     雄性首领要确保迟缓的家族成员
260. with the slower members of his family.
     也能安全通过
261. If the group is to get what they need...
     如果黑猩猩群想要得到填饱肚子
262. ..they will have to go against their natural instincts...
     它们就不得不违背本能

来自《行星地球 第三季 第五集 Planet Earth S03E05 森林》第 259 行