From memory, the wildebeest are coming 鳄鱼凭着记忆得知 角马已经来了

109. but also dangerous obstacles.
     也是充满危险的关隘
110. This is one of the largest concentrations of Nile crocodiles in Africa,
     这里是非洲一处最大的尼罗鳄聚集地
111. giants that grow over five metres long.
     这些大怪物能长到5米多长
112. From memory, the wildebeest are coming
     鳄鱼凭着记忆得知 角马已经来了
113. and gather in anticipation.
     不出所料 它们纷纷下水
114. The crocodile's jaws snap tight like a steel trap -
     鳄鱼的巨口像捕兽铗一般紧咬住猎物
115. once they have a hold, they never let go.
     一旦被它逮住 猎物再无逃脱的机会

来自《行星地球 第一季 第三集 Planet Earth S01E03 淡水》第 112 行