gravity-arch dam

例句：

1. 1. The construction of the gravity-arch dam is a significant engineering achievement.
   重力拱坝的建设是一项重大的工程成就。
2. 2. The gravity-arch dam has been used to store water for irrigation purposes.
   重力拱坝被用来储存水以进行灌溉。
3. 3.The gravity-arch dam is an important structure in the region's hydropower system.
   重力拱坝是该地区水力发电系统中的一个重要结构。