dutiful：尽职尽责的；恭敬的，孝顺的

词根词缀：duty(y→i)责任 + -ful形容词词尾,充满

• dioptrics
• diorama
• dioxide
• dioxin
• dip
• diphtheria
• diphthong
• diplodocus
• diploid
• diploma
• diplomacy
• diplomat
• diplomatic
• diplomatist
• dipole
• dipper
• dippy
• dipsomaniac
• diptych
• dire
• direct
• direction
• directly
• director
• directory