Smart Device Translates American Sign Language To English智能传感器把美国手语翻译成英文American Sign Language (ASL), has been one of the primary means of communication for the deaf in the United States and many parts of Canada since the 1800s. It is estimated that between 500,000 to 2 million people use the language on a regular basis.19世纪来,美国手语已沦为美国和加拿大大部分地区失明之人交流的主要方式。