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单词 pyroclastic
释义 py·ro·clas·tic
I. \| ̷ ̷ ̷ ̷|klastik\ adjective
Etymology: pyr- + -clastic
: formed by fragmentation as a result of volcanic or igneous action
 < pyroclastic rocks >
II. noun
(-s)
: a volcanic rock composed of pyroclasts
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