科学家们长期以来一直关注聋哑人的大脑是如何处理手语的。
Scientists have long been interested how the deaf process signed languages in the brain.
手语是聋哑人的母语，是他们自幼在最自然的状态下习得的第一语言。
Sign language is the mother tongue of deaf people, and the "first language" they acquire naturally.
一直以来，聋哑人与健康人之间的交流就十分的困难，特别是没有学习过手语的人。
All along, the deaf and the communication between healthy people will be very difficult, especially in those who do not study and pass-through language.
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