低买高卖：
a day trader watches stock prices carefully ,when he sees a stock rise in price he uses the computer to buy shares of the stock.
if the stock continues to rise in price in the next few minutes the say trader sells the shares quickly to make a small profit
then he looks for another stock to buy
if a stock goes donw instead of up ,he sells it and accepts the loss .
股票期权：the stock options were listed in the company diractory .目录
商业洞察和技术决窍；
my business acumen and technical know how .
高科技企业：the high tech industry .
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