His voice wandered on in the dull, matter-of-fact tones of someone describing his own environment.
他的声音一直是低沉的，不带感情的，像是一个人在介绍自己身边的物件。
Local guides describe the history of various places in matter-of-fact tones.
当地导游以一种平淡无味的语气描述着各个地方的历史。
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