基本解释裂點，節點词组短语短語gully and knick point 沖溝裂點knick point更多词组英英字典柯林斯英英字典 a break in the slope of a river profile caused by renewed erosion by a rejuvenated river knick point剑桥字典knick point柯林斯字典专业释义地球科學裂點泥尅點尼尅點節點環境科學技術節點