Dolphins are part of the whale family, but they are smaller than whales., 海豚是鯨魚家族的一部分，但牠們比鯨魚小。, Most dolphins are seven to ten feet long., 大多數海豚長約七到十英尺。, Some dolphins can grow even longer., 有些海豚可以長得更長。, They have two flippers and one fin on their backs., 牠們有兩個鰭肢，背上有一個鰭。, flippers, 鰭肢, fin, 鰭, back, 背.

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