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.

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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.

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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.

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