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Nowadays I got the secret to master languages.
After studying the grammar, the only thing I have to do is to enrich the vocabulary.
If we would like to read English books without any trouble, we should have a large vocabulary with 10,000 words.
We would forget the words very soon, even if we eagerly try to memorize them.
But a person who doesn’t mind it and continues to study must be called a genius for languages.