i am a chinese student .an english learner.
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I think about 1000 words are more than sufficient, if you don't need words related to some specific field.
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There are a lot to learn. It is better for you to keep learning and absorbing as much English as possible. Even native English people, they still have a lot to learn.
I suppose as many as you can. The ones for basic communication should be first. I wish you well.
English has hundreds of thousands of words, many are obsolete. Scientific words enter the language faster than obsolete ones die. I know a great many words, but surely not all. My guess: maybe 8,000 or 9,000 tops.
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