全世界現存的海龜共有七種。早期的海龜分化出四種不同類型，其中兩類因無法

全世界現存的海龜共有七種。早期的海龜分化出四種不同類型，其中兩類因無法有效攝食而滅絕，第三類約出現在1億1000萬年前，其中只有革龜因為掠食當時海中最多的食物——浮游性的水母，因此成為唯一活下來的物種。

結果 (英文) 1:

There are seven existing sea turtle in the world. The early differentiation of four different types of sea turtles, which can not be effective due to ingestion of two types of extinction, appears in the third class about 110 million years ago, which was only the leatherback sea predators because most food - planktonic jellyfish thus becoming the only surviving species.

結果 (英文) 2:

There are seven species of sea turtles in the world. Early turtles diverged into four different types, two of which were extinct because they could not be fed effectively, and the third occurred about 110 million years ago, with only leather turtles becoming the only species to survive because they preyed on the most food in the sea at the time, the plankton jellyfish.

結果 (英文) 3:

There are seven species of sea turtles in the world. The early turtles were divided into four different types, two of which were extinct because they could not eat effectively. The third type appeared about 110 million years ago, among which only leatherback turtles became the only living species because they ate the most food in the sea at that time, the floating jellyfish.