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。
If you make an "OK" sign with your thumb and finger, that is the shape for the letter "f" in American sign language.
人类看手势是非常必要的。做一个简单的实验。
Our human need to see hands is so important you can try a simple experiment.
人类看手势是非常必要的。做一个简单的实验。
Our human need to see hands is so important you can try a simple experiment.
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