River dolphins have no predators, except for humans.
淡水河豚没有天敌，除了人类。
She got her start number-crunching nature with her PhD thesis, a DNA analysis of river dolphins.
她开始她的有关自然的大量运算的博士论文，一篇关于白鳍豚的DNA分析。
It was at the Mekong, just north of Stung Treng, that I set out to see the Irrawaddy river dolphins, some of the last remaining on the planet.
就是在上丁北面的湄公河上，我看见了在地球上最后幸存的短吻海豚。
Highlights include Angkor Wat, one of the most exotic tourist destinations in the world, and the renowned Mekong River dolphins, which can be found in Cambodia .
世上最具异国风情的景点之一-吴哥窟、只有在柬埔寨才能看得见的著名湄公河海豚等。
Then a couple more to the left, and more to the right, before I finally realised that I was at the centre of a pod of Irrawaddy river dolphins, one of the rarest species on the planet.
我终于意识到，自己已经在一群短吻海豚中间，这是地球上最稀有的物种之一。
However, researchers found that piranha most likely group together as a defense against such predators as river dolphins, caimans and bigger fish, and not to engage in feeding-frenzies.
然而，研究者们发现，食人鱼群集的时候多数情况是防御那些如淡水豚、鳄鱼和大型鱼等掠食者的攻击，而不是进行食物猎取。
When this inland sea retreated, Hamilton hypothesizes, the Amazon dolphins remained in the river basin, evolving into striking creatures.
哈密尔顿推测，当这片内陆海退去，亚马逊河豚在流域留了下来，逐渐进化为一种恐怖动物。
"I'm 70 years old, and I've been on the river my entire life," Vargo said. "I've seen dolphins and everything else, but never a manatee."
瓦尔戈说：“我已经70岁了，我一直都住在哈德逊河。我以前曾在这里见到过海豚和其它很多种动物，但却从未亲眼看见过一头海牛。”（独家编译国际在线教育张咏蒋黎黎）
Every spring the Amazon dolphins get to leave the confines of their river channel for a taste of their former habitat.
每年春天，亚马逊河豚离开所属河道的范围，到从前的栖地去晃一晃。
When this inland sea retreated, Hamilton hypothesizes, the Amazon dolphins remained in the river basin, evolving into striking creatures that bear little resemblance to our beloved Flipper.
哈密尔顿推测，当这片内陆海退去，亚马逊河豚却留了下来，逐渐进化为一种恐怖动物，与我们钟爱的鳍状肢动物，外貌上已大相径庭了。
Occasionally we would see pods of the small pink dolphins which inhabit the Pearl River estuary area, now an endangered and protected species.
偶尔，我们也能在珠江口水域看到成群的小海豚，身上还粉嘟嘟的，如今它们已是濒危保护动物了。
Occasionally we would see pods of the small pink dolphins which inhabit the Pearl River estuary area, now an endangered and protected species.
偶尔，我们也能在珠江口水域看到成群的小海豚，身上还粉嘟嘟的，如今它们已是濒危保护动物了。
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