名词
中文翻译：火山灰
同义词：
['volcanic ash', 'volcanic rock debris例句：1. The eruption of the volcano has left a thick layer of tephra on the ground.（火山喷发留下了厚厚的一层火山灰在地面上。）2. The tephra layers in the area are evidence of past volcanic activity.（该地区的火山灰层是过去火山活动的证据。）']
例句：
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1. The eruption of the volcano has left a thick layer of tephra on the ground.
火山喷发留下了厚厚的一层火山灰在地面上。
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2. The tephra layers in the area are evidence of past volcanic activity.
该地区的火山灰层是过去火山活动的证据。
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3. The tephra deposits from the eruption have been studied for their potential use as building materials.
这次喷发产生的火山灰被研究用于作为建筑材料的潜在用途。