虎鲸

例句：

1. 1. Orcas are known for their intelligence and playfulness.
   虎鲸以其智能和活泼而闻名。
2. 2. The orca pods are often seen swimming together in the ocean.
   虎鲸群经常一起在海洋中游动。
3. 3.Researchers have been studying the behavior of orcas to better understand them.
   研究人员一直在研究虎鲸的行为，以便更好地理解它们。