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翻译一个句子..Only in the past 20 years have specialists in langua

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翻译一个句子..
Only in the past 20 years have specialists in language study realized that signed languages are unique - a speech of the hand.
翻译一个句子..Only in the past 20 years have specialists in langua
语言研究的专家在近20年才意识到符号语言的独特性- 一种手的语言