| 1. 劍橋英英字典 difficult difficult |
2. 雅虎奇摩字典 difficult |
3. 韋氏線上字典 difficult |
4. 朗文英英字典 difficult |
| 5. Google字典 difficult |
6. icibt寫作句庫 difficult |
7. 美國遺產字典 difficult |
8. wiktionary difficult |
| 9. Wikipedia difficult |
10. Howstuffworks difficult |
11. Urban Dictionary difficult |
12. EarthSky difficult |
| 13. answers.com difficult |
14. WordReference.com difficult |
15. 英漢詞典 difficult |
16. yourdictionary.com difficult |
| 17. Webster Dictionary difficult |
18. onelook.com difficult |
19. W3dictionary difficult |
20. Medlineplus dictionary difficult |
| 21. Inogolo(名字發音) difficult |
22. Forvo(發音) difficult |
23. Quotations(語錄) difficult語錄 |
24. 韋氏線上學生字典 difficult |
| 25. 韋氏線上學生詞典 difficult |
26. 韋氏線上押韻字典 difficult |
27. Thesaurus.net同義字典 difficult |
28. Macmillan Dictionary difficult |
| 29. Macmillan Thesaurus difficult |
30. getwords.com difficult |
31. bettermedicine.com difficult |
32. Collins difficult |
| 33. Oxford Dictionary difficult |
34. Oxford ALD difficult |
35. ozdic.com difficult |
36. Oxford American difficult |
| 37. Stanford Encyclopedia of Philosophy difficult |
38. 圖片搜尋 difficult |
39. PDF搜尋 difficult |
40. SWF搜尋 difficult |
| 41. English-cobuild difficult |
42. Babylon English difficult |
43. Babylon Search difficult |
44. AlphaDictionary difficult |
| 45. 線上英漢字典 difficult |
46. Wordnik difficult |
47. 同義與反義字 difficult |
48. howjsay . com difficult |
| 49. Medical Dictionary difficult |
50. Your Dictionary Sentences difficult |
51. PronounceHow difficult |
52. Dictionary Reverso difficult |
| 53. Memidex(發音) difficult |
54. dict.cc difficult |
55. Name Pronunciation difficult |
56. Vocabulary.com difficult |
| 57. WebMD difficult |
58. 海詞 difficult |
59. 新浪香港 difficult |
60. Linguee difficult |
| 61. VoiceTube difficult |
62. 大詞典 difficult |
63. sentencedict.com difficult |
64. definition-of.com difficult |
| 65. YouTube difficult |
66. 詞都 difficult |
67. 押韻詞典 difficult |
68. RhymeZone difficult |
| 69. RhymeZone difficult |
70. 漢語詞典 difficult |
71. Pronounce Names difficult |
72. Youglish difficult |
| 73. 查文法 difficult |
74. Purdue OWL difficult |
75. Reference.com difficult |
76. Ozdic.com 語詞搭配 difficult |
| 77. OXFORD 語詞搭配 difficult |
78. YARN movie clips difficult |
79. Ted.com difficult |
80. thesaurus.plus difficult |
| 81. cliffsnotes difficult |
82. sparknotes difficult |
83. Describing Words difficult |
84. Ludwig difficult |
| 85. study.com difficult |
86. webmd.com difficult |
87. word hippo(adj) difficult |
88. word hippo(noun) difficult |
| 89. word hippo(verb) difficult |
90. word hippo(adv) difficult |
91. word hippo(singular) difficult |
92. word hippo(pl.) difficult |