此法以反射地震资料中的观测初至旅行时与模型射线追踪旅行时之差的最小平方法为基础。
It is based on the least square of the difference between the real reflection first break time and corresponding modeled ray-tracing travel time.
你可以追踪并记录旅行路线、拍摄照片及视频、撰写博文、获得旅行距离、时间和地形等数据。
You can track and record your travel routes, photos, videos, blog entries, and even statistics such as distance, time and geography traveled.
类似地，在2002年电视台选择流行歌星参与“旅行人”节目，这个节目是从非洲到亚洲追踪人类的起源。
Similarly, in 2002, the pop star was selected by the channel to participate in the "Journey of man" project, which traced the origins of human evolution from Africa to Asia.
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