n.鲸类
cetacean的复数

原形：cetacean复数：cetaceans

Cetaceans are a widely distributed and diverse group of aquatic mammals that include whales, dolphins, and porpoises.
哺乳动物中的鲸目动物包括广泛分布且种类多样的水生哺乳动物，如鲸鱼、海豚和鼠海豚。
The blue whale is the largest cetacean and, in fact, the largest animal on Earth.
蓝鲸是最大的鲸类，同时也是地球上最大的动物。
Dolphins are highly intelligent cetaceans known for their complex social behaviors.
海豚是非常聪明的鲸类，以其复杂的社会行为而闻名。
Orcas, also known as killer whales, are actually a type of cetacean rather than sharks.
鲸鲨，又称为虎鲸，实际上是一种鲸类而非鲨鱼。
Some cetaceans, like humpback whales, are famous for their beautiful songs during mating season.
一些鲸类，比如座头鲸，在繁殖季节会因其美妙的歌声而著名。
Sperm whales are the deepest diving cetaceans, capable of reaching depths over 7,000 feet.
抹香鲸是最深潜水的鲸类，能够下潜至超过7000英尺的深度。
River dolphins, such as the Amazon river dolphin, are freshwater cetaceans found in various rivers around the world.
河豚，如亚马逊河豚，是生活在世界各地河流中的淡水鲸类。
Cetaceans face numerous threats, including entanglement in fishing nets, pollution, and habitat loss due to climate change.
鲸类面临多种威胁，包括被渔网缠绕、污染以及因气候变化导致栖息地丧失。
Scientists use the study of cetacean DNA to better understand the evolutionary relationships within the group.
科学家通过研究鲸类的DNA来更好地理解该群体内的进化关系。
Conservation efforts aim to protect cetaceans from extinction by regulating hunting practices, reducing ocean noise pollution, and creating marine protected areas.
保护工作旨在通过规范捕猎行为、减少海洋噪声污染及设立海洋保护区等方式防止鲸类灭绝。