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When rivers finally reach the sea,
當(dāng)江河最終匯入大海時(shí)
they slow down, release their sediment and build deltas.
水流減緩，留下大量泥沙，堆成了三角洲
In Bangladesh, the Ganges and Brahmaputra rivers join to form the world's biggest.
在孟加拉國(guó)，恒河與雅魯藏布江的交匯處形成了世界上最大的三角洲
Every year, almost 2,000 million tonnes of sediment eroded from the Himalayas is delivered to the ocean.
每年大約有20億噸泥沙在此沉淀，從喜馬拉雅山脈上崩塌下來的土石最終歸于大海
At the delta's mouth, the largest mangrove forest in the world, the Sunderbans.
三角洲河口地帶有一片世界上最大的紅樹林，孫德爾本斯紅樹林。
These extraordinary forests spring up throughout the tropics in these tidal zones where rivers meet the sea.
這些特殊的樹林遍及整個(gè)熱帶地區(qū)的潮間帶，那里正是河流的入海口
Crab-eating macaques are mangrove specialists.
食蟹猴是紅樹林的特有物種
In Indonesia, these monkeys have adopted a unique amphibious lifestyle.
在印度尼西亞，這些猴子過著一種獨(dú)特的雙棲式生活
They fish out fallen food.
它們揀食落在水中的食物。
The troop also uses the waters to cool off during the heat of the day.
在白天酷熱難耐之時(shí)，猴群會(huì)利用水來給身體降溫。
