海豚 (hǎitún) means "dolphin." The word combines 海 (sea) and 豚 (a type of pig), reflecting an older naming convention. It is the standard term used in both everyday conversation and scientific contexts when discussing marine mammals.
海豚是一种非常聪明的动物,能学会很多动作。
Hǎitún shì yī zhǒng fēicháng cōngmíng de dòngwù, néng xuéhuì hěn duō dòngzuò.
Dolphins are very intelligent animals that can learn many tricks.
我们在海边看到一群海豚在水里跳跃。
Wǒmen zài hǎibiān kàn dào yī qún hǎitún zài shuǐ lǐ tiàoyuè.
We saw a pod of dolphins jumping in the water at the seaside.
孩子们最喜欢去水族馆看海豚表演。
Háizimen zuì xǐhuan qù shuǐzúguǎn kàn hǎitún biǎoyǎn.
The children love going to the aquarium to watch the dolphin show the most.