That sign languages may be full-blown languages but they just take — they're just harder to learn because the brain and the body have adapted for speech.
手语或许是成熟的语言，但它们更难学，因为大脑和身体已经适应了口语。
That sign languages may be full-blown languages but they just take — they're just harder to learn because the brain and the body have adapted for speech.
手语或许是成熟的语言，但它们更难学，因为大脑和身体已经适应了口语。
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