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The Pearl Estuary has become one of the busiest shipping channels in China, and the dolphins are constantly bombarded with sound.
珠江口已成為中國最繁忙的海運通道之一，海豚也經常受到噪音的狂轟濫炸。
New research suggests that they may now pack more information into shorter calls in a bid to be heard.
新的研究指出，他們的叫聲中可能包含了更多的信息并變得更短促。
Local conservationists have now set up a protected zone near Lantau Island. So, for now, China's white dolphins are holding on.
當地的環保主義者如今在珠江口附近建立起一個保護區，中華白海豚從此得以生存。
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