They must remain silent until they close in on their rivals. 在接近对手之前它们必须保持缄默

282. Not far away the neighbors are feeding in a fig tree
     就在不远处,邻居正在无花果树上进食
283. oblivious to the approaching dangers.
     他们还不知道危险正在接近
284. The patrol moves off with a sense of purpose.
     巡逻队继续向目标进军
285. They must remain silent until they close in on their rivals.
     在接近对手之前它们必须保持缄默
286. The attack is on.
     攻击开始了!
287. To intimidate their opponents, the aggressors scream and drum on buttress roots.
     为了壮声势,它们尖叫着并击打树根冲向战场
288. Several males corner an enemy female.
     几只公猩猩把一只母猩猩逼上绝境

来自《行星地球 第一季 第八集 Planet Earth S01E08 热带雨林》第 285 行