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Lines of wildebeest are on the march.
一隊隊的角馬正在遷徙途中
Each year, nearly two million animals migrate across the Serengeti Plains in search of fresh, green pastures.
每年都會有將近200萬只角馬橫越塞倫蓋蒂平原，去尋找新鮮草場
For these thirsty herds,
對于這群饑渴難耐的角馬來說
the rivers are not only a vital source of drinking water but also dangerous obstacles.
河流不僅是唯一能解渴的重要水源，也是充滿危險的關隘
This is one of the largest concentrations of Nile crocodiles in Africa, giants that grow over five metres long.
這里是非洲一處最大的尼羅鱷聚集地，這些大怪物能長到5米多長
From memory, the crocodiles know the wildebeest are coming and gather in anticipation.
鱷魚憑著記憶得知，角馬已經(jīng)來了，不出所料，它們紛紛下水
The crocodile's jaws snap tight like a steel trap.
鱷魚的巨口像捕獸鋏一般緊咬住獵物
Once they have a hold, they never let go.
一旦被它逮住，獵物再無逃脫的機會
It took over an hour to drown this full-grown bull.
它得花上一個多小時才能淹死這只成年公角馬
To surprise their prey, crocodiles must strike with lightning speed.
為了突襲獵物，鱷魚必須以閃電般的速度出擊
Here, only the narrowest line separates life from death.
在這里，生與死只有一線之隔。
