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 tau·tom·er·ism /tɔˈtɑməˌrɪzəm/
 互變現象

 tau·tom·er·ism /tɔˈtɑməˌrɪzəm/ 名詞
 互變異構(現象)

 Tau·tom·er·ism n.  Chem. The condition, quality, or relation of metameric substances, or their respective derivatives, which are more or less interchangeable, according as one form or the other is the more stable. It is a special case of metamerism; thus, the lactam and the lactim compounds exhibit tautomerism.
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