... triggers ['trigə] 触发 Extended objects 对象扩展 Aggregate objects ['ægrigeit] 总计对象 ...
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... Standard Primitives（标准原始对象） Extended Objects（扩展原始对象） Compound Primitives（复合物体） ...
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extended spatial objects 扩展空间对象
When viewing extended objects, the apparent brightness seen in the eyepiece is a function only of aperture and magnification, it is not related to focal ratio.
当观察扩展光源时，目镜中所看到的亮度只跟孔径和放大率有关，它跟焦比并没有关系。
Telescopes with small (sometimes called "fast") focal ratios do, however, produce brighter images of extended objects on film, and thus require shorter exposure times.
小(有时候称“快”)焦比的望远镜确实能够在底片上呈现出更亮的图像，因此需要的曝光时间可以更短。
The speckle imaging quality of space extended objects is limited by photon density in short exposure images.
空间扩展目标斑点成像的质量受到短曝光像中光子密度的限制。
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