峡谷的定义是类似于一个裂口。
对发育于渭北地区的口镇-关山大断裂口镇段的冶峪河谷地貌进行了研究。
Yeyu river valley geomorphology in Kouzhen of Kouzhen-Guanshan faults in north of Weihe river is researched.
毛萼田菁的茎瘤形成于茎上蛰伏的不定根发生点。 当合适的根瘤菌从不定根发生点裂口入侵后，刺激不定根原基周围的皮层细胞分裂形成含菌组织而发育成茎瘤。
Rhizobium sesbania infected through the apical rupture of the growing site of adventitious root, multiplied in the fissure around the root primordium and stimulated the division of cortex cells.
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