rationale：根据，理论说明，理论基础

来自rational,合理的，经过思考的，-ale,名词后缀。

• ethic
• ethnic
• ethnical
• ethnocentric
• ethnogeny
• ethnographer
• ethnography
• ethnologist
• ethnology
• ethos
• ethyl
• ethylene
• ethyne
• etiolated
• etiology
• etiquette
• Eton
• etude
• etymology
• etymon
• eu-
• eucalyptus
• Eucharist
• Euclidean geometry
• eugenics