海豚不仅是一种有趣的动物而且极其聪明。
Dolphins are not only playful animals, but they are also highly intelligent.
然而，有些科学家说，海豚，一种海中的哺乳动物，也有那么聪明。
Some scientists, however, say that the dolphin, a sea mammal, is just as smart.
而海豚只是承受威胁的多种生物其中的一种。
与海豚游泳是一种让你心里充满快乐的经历。
Swimming with dolphins is a wonderful adventure that will fill your heart with happiness.
海豚是一种哺乳动物。
他们教给了海豚一种新的把戏。
海豚是一种聪明的动物。
海豚是一种聪明的动物。
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