把口径误差表示为焦点与端面的相对位移，可以定量计算口径误差对象质的影响。
Heretofore, the error of the size of apertures is represented as a relative shift between the focus and the edge surface of the mirror, and then the image quality is computed accordingly.
随着基坑开挖深度和规模的增大，其位移和稳定问题日益成为工程界关注的焦点。
But with the increase of excavation depth and scale, the displacement and stability problem is becoming a focus in engineering world.
应用推荐