"We've only had this technology around for about fifteen years, and most carcinogens will take about several decades, thirty-forty years to develop a cancer.
VOA: special.2011.06.06
The options have been traded for several decades, starting with the Chicago Board Options Exchange.
期权最初从芝加哥期权交易所进行交易,到现在已经交易了几十年
The options have been traded for several decades, starting with the Chicago Board Options Exchange.
期权最初从芝加哥期权交易所进行交易,到现在已经交易了几十年
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