'Delphinapterus leucas'是拉丁语，意为“白鲸”，是一种生活在北极地区的中型齿鲸，也被称为白海豚。
例如：
1. 'Delphinapterus leucas' is the only species of whale that is capable of swimming backwards.（'Delphinapterus leucas'是唯一能够向后游泳的鲸类物种。）
2. The habitat of 'Delphinapterus leucas' ranges from the Arctic Ocean to subarctic and subantarctic rivers.（'Delphinapterus leucas'的栖息地范围从北极洋到亚北极和亚南极河流。）
3. The average lifespan of 'Delphinapterus leucas' ranges from 25 to 30 years.（'Delphinapterus leucas'的平均寿命为25到xx年。）
4. 'Delphinapterus leucas' is characterized by its stout body and short, broad head.（'Delphinapterus leucas'以其健壮的身体和短而宽的头部而闻名。）
5. 'Delphinapterus leucas' is able to dive to depths of over 1,000 meters.（'Delphinapterus leucas'能够潜至超过1,000米的深度。）
6. The diet of 'Delphinapterus leucas' consists mainly of fish such as Arctic cod, shrimp and squid.（'Delphinapterus leucas'的主要饮食包括北极鳕鱼、虾和鱿鱼。）
7. The population of 'Delphinapterus leucas' is estimated to be between 50,000 and 80,000 individuals.（据估计，'Delphinapterus leucas'的种群数量在5万到8万之间。）
8. 'Delphinapterus leucas' has a thick layer of blubber that protects it from the cold waters of the Arctic.（'Delphinapterus leucas'有一层厚厚的脂肪保护它免受北极寒冷的水的影响。）
9. 'Delphinapterus leucas' is often hunted by indigenous peoples for its meat and skin.（'Delphinapterus leucas'经常被土著人捕猎，以获取其肉和皮。）
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