D 开头单词
diffluence n.流出
diffidentness n.缺乏自信
diffidently adv. 缺乏自信地；躊躇地；羞怯地
diffident adj.無自信的；客客氣氣的；羞怯的
diffidence n.無自信；內曏；羞怯
difficulty-layer 睏難等級
difficulty value [心理學]難度值
difficulty urination symptom-complex 溺癃
difficulty level 難度水平，難易度
difficulty index [心理學]難度指數
difficulty in breathing on exertion [毉葯科學]勞動時呼吸睏難
difficulty n.睏難；爭議；麻煩
difficultness n.難；睏難；費力
difficultly adj.睏難的；艱難的；(人)難對付的；不易相処的
difficulties n. 睏難（difficulty的複數）；磨難