It also includes a consideration of possible alternatives, such as a concrete gravity dam or an earth-fill embankment dam. 还要考虑到可能的备选方案，比如是选择混凝土重力坝还是选择填土筑堤大坝。
Engineering structures falling in this category are gravity dams with foundations, slopes and embankments, etc. 属于这种范畴的工程结构为带有基础的重力坝，斜坡和路堤等。
