D 开头单词
diffluence n.流出
diffidentness n.缺乏自信
diffidently adv. 缺乏自信地；踌躇地；羞怯地
diffident adj.无自信的；客客气气的；羞怯的
diffidence n.无自信；内向；羞怯
difficulty-layer 困难等级
difficulty value [心理学]难度值
difficulty urination symptom-complex 溺癃
difficulty level 难度水平，难易度
difficulty index [心理学]难度指数
difficulty in breathing on exertion [医药科学]劳动时呼吸困难
difficulty n.困难；争议；麻烦
difficultness n.难；困难；费力
difficultly adj.困难的；艰难的；(人)难对付的；不易相处的
difficulties n. 困难（difficulty的复数）；磨难