Traders placed an unusually large number of bets on two obscure companies at the start of last week, days before a disclosure by chipmaker Nvidia triggered a furious rally in their shares.
上周伊始，交易员们对两家名不见经传的公司下了异常大的赌注，几天后芯片制造商英伟达披露的消息引发这两支股票大涨。
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