trade stock和商品好像是兩回事

stock是ownership of a company,trading stock不是工作. 倒賣商品,如果是開店大招牌,應該是retailing,算是工作 (work)。Work is not just employment. F1 student can only work on campus or under OPT training.

I am not specialized in immigration law, these are just my impressions.

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