Warren buffett once called derivatives financial instruments of mass destruction .

沃伦•巴菲特曾把衍生金融工具比作大规模杀伤性武器。

About 650 others have been discovered by other instruments .

其他仪器大约发现了另外650个行星。

What complicates matters further is the sheer variety of instruments .

乐器的种类数量之多进一步把问题复杂化。

The kepler instruments cannot measure atmospheric or geological properties .

开普勒团队的器械不能测量大气或是地质特性。

What instruments did they use ?

她们使用什么样的工具？