Home/pentamethylenepentamethylene/pen-tuh-meth-uh-leen/US // ˌpɛn təˈmɛθ əˌlin //五乙烯,五甲基苯酚,五甲基化,戊烯Definitionsn.名词 noun1 Chemistry.: cyclopentane. Level 4Browse all words →