Headward erosion is main cause of river captrue, but it is not only;
溯源侵蚀是河流袭夺的主因，但不是唯一原因；
The article was discussed that national standard samples acted importantly on magnitude headward of air automatic monitoring system.
阐述了国家标准样品在空气自监测系统量值溯源中的重要作用。
The change of ephemeral gully headward erosion, gully-wall collapsing and deep-cutting erosion were quantified in the three stages of initial-phase, metaphase and anaphase.
阐明了在浅沟发育初期、中期和后期三个发育阶段，沟头溯源侵蚀、沟壁扩展和沟床下切侵蚀变化规律。
The change of ephemeral gully headward erosion, gully-wall collapsing and deep-cutting erosion were quantified in the three stages of initial-phase, metaphase and anaphase.
阐明了在浅沟发育初期、中期和后期三个发育阶段，沟头溯源侵蚀、沟壁扩展和沟床下切侵蚀变化规律。
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