然后将 $print 类变量设为 1，直接将库指定到输出的 XHTML。
Then you set the $print class variable to 1, specifying to the library to output XHTML directly.
采用陶瓷外喷嘴可以将喷嘴高度设为零，即喷口端面直接接触被切割表面，可以获得很好的效果。
Adopt ceramic nozzle can be the nozzle, that is set to zero height vent end direct contact with the surface is cut, can achieve very good result.
然而在具体应用中，大部分学者直接将标的资产的价格设为几何布朗运动，并未进行深入研究。
Most researchers directly take an assumption that underlying assets price moving mode is Geometric Brownian Motion, don't ever deeply consider whether it is proper.
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