声调不是一开始就有的。是发音简化的结果。汉语到南北朝时期产生明确的声调。藏语声调产生得更晚,有些藏语方言至今没有声调。
本帖于 2026-04-09 10:38:51 时间, 由普通用户 方外居士 编辑
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