Before the tide came, on the partially dry riverbed, there were various tree patterns scoured by the Qiantang River, and the straight and hard the Jiashao Bridge was built on the "trees", which was in sharp contrast.The contrast between firmness and softness fascinated me.On the other hand, the tree pattern on the riverbed, like the meridians and veins, seems to nourish the bridge, giving people the inspiration for construction.