"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

耶鲁公开课 - 金融市场课程节选

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

耶鲁公开课 - 金融市场课程节选