86. digestion
He can only eat the food that is easy of digestion. 他只能吃易于消化的食物。
87. direction
Tom went off in one direction and Harry in another direction. 汤姆朝着一个方向去，哈里朝另一个方向去。
She feels the need of direction. 她感到需要有人指导她。
88. discovery
He made wonderful scientific discoveries. 他完成了惊人的科学发现。
89. discussion
The question is still under discussion. 这个问题仍在讨论中。
90. disease
The business of doctors is to prevent and cure disease. 医生的职责是预防和治疗疾病。
