著名的语言学者Alexander Arguelles（亚历山大·阿圭列斯）对词汇量做出如下解读：
250个单词构成一门语言最基础的核心，没有这些词你无法组合句子。
750个单词构成每个人每天说话会用到的词汇。
2500个单词应该可以让你说出任何你想表达的内容，虽然有时会词不达意
5000个单词构成教育水平一般的母语使用者的积极词汇量。
10000个单词构成有较高教育水平的母语使用者的积极词汇量。
20000个单词可以使你几乎无障碍地阅读、理解和享受文学作品。
而词汇测试网站也曾针对不同人群的词汇量做了一个相对真实完整的调查。
主要用来根据用户的年龄，受教育程度来评估个人的词汇量，尤其是外语课堂学习与本土学习的对比。
结果显示：
大多数成年母语使用者的词汇量为20000—35000个单词
8岁的母语使用者平均词汇量为10000个单词
4岁的母语使用者平均词汇量为5000个单词
然而，对于外语学习者的调查结果则让人大跌眼镜：
大多数外语学习者的词汇量仅徘徊在4500—5000个单词左右，相当于4岁母语使用者的词汇量；
而常年生活在英语国家的外语学习者单词量也仅仅是10000个单词，和8岁母语使用者的词汇量相差无几。
对于打算出国留学的同学们来说，不光是应付标化考试如SAT、ACT、托福等考试所需词汇，还有留学后生活、学习方面，词汇量都非常的重要，词汇量上不去为什么，记不住，背不下来是根源。那如何记忆单词？
常见的就是词根记忆法，这个方法怎么用就不说了，大家都耳熟能详了，下面分享的30个最常用最普遍的词根：
1. Psych — (G) Mind
Psychology (the study of the mind)
2. Phil — (G) Love
Cinephile (movie lover)
3. Struc — (L) Build
Structure (parts or pieces built into something complex)
4. Vac — (L) Empty
Vacuous (having an empty mind, not thinking)
5. Ver — (L) True
Veritable (real, true, authentic)
6. Scrib/Scrip — (L) Write
Prescription (a written note signed by a doctor which provides instructions for medicine or treatment)
7. Mega — (G) Great, large
Megaphone (a large device which makes your voice louder)
8. Mono — (G) Single
Monochromatic (having only one color)
9. Luc — (L) Light
Lucid (bright, clear)
10. Mal — (L) Bad
Malevolent (wanting to do bad or evil things)
11. Mar — (L) Sea
Marina (a port or harbor for boats and ships)
12. Manu/Mani — (L) Hand
Manicure (a treatment to make your hands look clean, neat and polished)
13. Min — (L) Small
Miniscule (very small in size)
14. Fort — (L) Strong
Fortitude (strength)
15. Mort — (L) Death
Mortician (someone who prepares dead bodies to be buried)
16. Nas/Nat — (L) Birth
Nascent (coming into existence, something just recently created)
17. Trans — (L) Across
Transatlantic (something which crosses the Atlantic Ocean)
18. Voc/Vos — (L) Voice
Vociferous (loud, someone who speaks loudly or talks a lot)
19. Aqua — (L) Water
Aquarium (a tank of water where fish are kept as pets)
20. Bene — (L) Good
Benevolent (wanting good things for people, generous, kind)
21. Chron — (G) Time
Chronological (organized by time of occurrence)
22. Bio — (G) Life
Biology (the study of living things)
23. Theo — (G) God
Theology (the study of religion)
24. Phone — (G) Sound
Telephone (a device used to talk with other people)
25. Omni — (L) All
Omniscient (knowing everything)
26. Sens/Sent — (L) Feel
Sentimental (emotional, attaching emotional value to things)
27. Terr — (L) Earth
Terrarium (a container for land animals kept as pets, often containing rocks, dirt or sand)
28. Vid/Vis — (L) See
Visible (able to be seen)
29. Auto — (G) Self
Automatic (happens on its own)
30. Poly — (G) Many
Polyglot (person who can speak many languages)
除了这些常见的词根，很多前缀、后缀的含义也都是固定的。
如，常见的前缀：
1. ad — (L) to, attached to
2. amphi — (G) both, about, around
3. andro — (G) man, male
4. semi — (L) half
5. non — (L) not
6. pre — (L) before
7. inter — (L) between
8. anti — (G) against, opposed
9. co — (L) with, together
10. mono — (G) one, single, alone
常见的后缀：
1. able — (L) is, can be
2. act — (L) state, quality
3. phil/phile — (G) fear, fearing
4. chrome — (G) color
5. logy — (G) study of
6. ism — (G) act, practice or result of
7. some — (G) body
8. cidal/cide — (L) killer, a killing
9. meter — (G) a measurement
10. nomy — (G) systematized knowledge of
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