在人类历史长河中，手写语言演化了不仅仅一次。
Written language may have evolved more than once in human history.
在悠久的历史长河中人类逐渐脱离野蛮状态而进入文明。
Man has gradually emerged from barbarism into civilization over the long history.
在悠久的历史长河中人类逐渐脱离野蛮状态而进入文明。
Man has gradually emerged from barbarism into civilization over the long history.
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