etymologies
n.
词源学，词源说明( etymology的名词复数 );
例句:
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This dictionary does not give etymologies.
这部词典不介绍词源.
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Dictionaries are still good for obscure usages and etymologies.
字典依然擅长于不常用的用法和词源.
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The branch of linguistics that deals with etymologies.
词源学有关词源的一门语言学分支.