该系统通过调整两块可动子镜，使其焦面光斑的质心位置与固定镜的重合校正子镜间的相对倾斜。

Segment alignment of tip-tilt is fulfilled by overlapping diffraction pattern centroids of the three individual segments on the focal plane.

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在更换电源之前，我们必须从望远镜上取下一个用四个螺丝固定的扶手。

Before we could replace the power supply, we would have to remove from the telescope a handrail fixed with four screws.

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直肠固定术和直肠前切除术已在腹腔镜下进行，效果很好。

Rectopexy and anterior resection have been performed laparoscopically with good results.

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