gravity abutment of arch dam

例句：

1. 1.The abutment of the bridge ismade of concrete.
   这座桥的支座是用混凝土做的。
2. 2. The engineer used the abutment to support the weight of thestructure.
   工程师利用这个支座来支撑结构的重量。
3. 3. The abutment was designedto withstand the force of the earthquake.
   这个支座被设计来承受地震的力量。