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Comments from Parents and Students
Effect of not knowing the words outside Oxford 3000TM word list
Myths about teaching and learning second language vocabulary
Perseverance is the key to success

Do you know how many words you need to acquire in order to master a discipline or a language ?

The number required varies a lot from discipline to discipline. Just give you a rough idea, for a 99.9% coverage of words in ordinary journals and articles,
Chinese requires : ~3300 characters / ~15000 terms
English requires : ~40000 word families
Alevel Chemistry requires : ~1200 terms

The reasons behind the differences are rather historical. When I have time, I hope I can write some articles to tell you the stories behind the evolution of different languages and how the present situation came up.