1. friendly:Oxford Advanced Learner's Dictionary(牛津高阶)
2. friendly:Longman Dictionary of Contemporary English(朗文当代)
3. friendly:Merriam-Webster's Learner's Dictionary( 韦氏高阶)
4. friendly:Collins COBUILD Advanced English Dictionary(柯林斯高阶)
5. friendly:Cambridge Learner's Dictionary(剑桥高级学习词典)
6. friendly:Macmillan English Dictionary(麦克米兰)
B 普通英语词典(英文，释义准确权威，但理解有难度，专业人士或本族语者使用)：
7. friendly:Oxford Dictionary
8. friendly:Merriam-Webster's Dictionary
9. friendly: Cambridge Academic Content Dictionary(剑桥学术词典)
10. friendly: American Heritage Dictionary(美国传统词典)
11. friendly:Wiktionary
C 双语词典(英汉汉英翻译词典)：
12. friendly:爱词霸词典
13. friendly:海词词典
14. friendly:有道词典
15. friendly:必应词典
D 其它词典：
16. friendly:Wordsmyth Beginner's Dictionary(Children's Dictionary)
17. friendly:Oxford Collocation Dictionary(牛津英语搭配词典)
18. friendly:Idiom Dictionary(习语词典)