从横切面上观察到，不定根原基起源于髓射线与维管形成层交叉的部位。
From cross sections of stems-cuttings, a primordium of adventitious roots originates from the cross region of pith rays and vascular cambium.
从图中可看出，给定射线与其路径中的段的交叉值总和是零。
As can be seen from the illustration, the sum of the values from a given ray crossing the segments in its path is zero.
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