If you make an "OK" sign with your thumb and finger, that is the shape for the letter "f" in American sign language.

如果你用拇指和其他手指做一个 “OK” 的手势，那就是美国手语中字母 “f” 的形状。

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Now, a little child could have language at its finger ends, while we are on to we have advanced so far in evolution road.

如今很幼小的孩童，就能熟练地操纵语言，我们才意识到已经在进化之路上前进了多远。

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These finger movements activate large regions of the brain involved in thinking, memory, and language.

手写时，手指运动刺激了大脑的大部分领域，包括控制思考，记忆和语言这几个区域。

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For example, the Hawaii Sign Language word for father is to wag your finger -- whereas in ASL, it's an open hand with fingers spread and a thumb to the forehead.

CNN: Researchers document distinctive Hawaii Sign Language

Once you click it, you can then swipe your finger across any text area to look up definition or translation, and you can choose your desired target language in the app's settings.

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