When you press the shutter release on the camera, a complex sequence of events occurs, including setting the aperture in the lens, flipping up the mirror of an SLR and a lot more.

实际上，当你按下快门时，一套复杂的程序开启，包括镜头内光圈的设置、一块单镜头反射镜的升起和其他更多的步骤。

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The surface figure precision of the primary mirror in a large aperture telescope is a key factor influencing the imaging quality.

大口径望远镜主镜的面形精度是影响望远镜成像质量的关键因素之一。

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The basic factors affecting collimating characteristic are off-axis magnitude, effective aperture and emission position on the focal plane of off-axis parabolic mirror.

影响离轴抛物镜准直特性的主要因素有离轴量，有效孔径和焦面出射点的位置。

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