The primary path length difference between asynchronous and synchronous polls is the allocation and eventual clean up of control blocks.

异步和同步poll之间的主要路径长度差异是，分配和最终清除控制块。

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Moreover, the difference of J-integral values increases with the increasing of the load and strength mismatching difference and the path-enclosed length of interface between weld metal and base metal.

载荷越大，焊缝与母材的强度差别越大；积分路径中包含的焊缝与母材界面长度越大，J积分的差值越大。

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Result shows that laser beam deflects to the direction which optical path length increase. The far-field intensity of laser beam is not the same for the difference of wavelength.

结果表明：强的激波结构使激光束远场强度分布发生了向光程增大方向的明显偏折，对于波长不同的激光束得到光束通过流场后的远场强度分布不同。

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Since the speed of light through a cable is consistent, the difference is entirely in the length of its path.

WSJ: A Dive Into the Digital Deep