感覺這個事情比較tricky，最好不要去做，第四條說的很清楚啊：
4. You should almost never try to volunteer in a private company, coz it is hard to defend yourself under strict policy of immigrant law which are usually very strict to foreigners.
4. You should almost never try to volunteer in a private company, coz it is hard to defend yourself under strict policy of immigrant law which are usually very strict to foreigners.
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