The plantaris muscle is used by animals in gripping and manipulating objects with their feet - something you see with apes who seem to be able to use their feet as well as their hands.
在动物中，跖肌的作用是抓住和控制脚上的东西，你可以在猩猩身上看到这点，他们的脚和手一样灵活。
Small clever animals, now with hands and feet, appeared and spread all over the earth.
一些小巧聪明、长着手脚的动物出现了，它们分布在地球的各个地方。
Finally about 2.6 million years ago some small clever animals, now with hands and feet, appeared and spread all over the world.
最后大约在两百六十万年前，一些有手有脚的小型聪明动物出现了，并且扩散到世界各地。
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