磁盘中的文件很大，但是其解析和验证的时间也很长。
The file is big on the drive, and takes a long time to parse through and to validate.
尤其是针对一些复杂系统，很难求出其解析逆系统。
It is hard to get the analytical inverse, especially to some complicated systems.
利用测度变换和鞅方法，得到了其解析形式的定价公式。
Using the measure transformation and martingale method, the price of the analytic form is obtained.
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