因为当棱镜置于会聚光束中时，离轴漂移造成有像散的像，格兰型棱镜的成像质量比尼·科尔型略好。
Since off-axis wander results in images which have astigmatism when the prism is placed in a converging beam, Glan types have slightly better imaging qualities than Nicla types.
野花遍地是：杂样儿，有名字的，没名字的，散在草丛里，像眼睛，像星星，还眨呀眨的。
Everywhere there are wildflowers of many kinds, those with names and those without, scattered throughout the thickets and looking like countless eyes or like stars, here and there winking at you.
本文在传统差动像散检测方法基础上，给出一种基于单向离焦的差动像散检测方法。
In this paper, the differential astigmatic detection method for defocus measurement with one-way defocused detector is developed from the conventional differential as.
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