misc. visual observation
对造纸沉积物的目视观察、化学分析和仪器分析手段进行了介绍，并根据实验室多年的分析结果，统计指出了造纸工业常见的沉积物种类。
This paper introduces visual observation, chemical test and instrumental analysis commonly used for deposit analysis. Lab statistics of deposit analysis results is also presented.
用来观察物体细节的简单目视光学器件，是焦距比眼的明视距离小得多的会聚透镜。
Used to observe the details of a simple visual objects, optical devices, is the focal length than the distance between eyes, as much out of the convergence lens.
事实上，不管我们的目视仪器有多么先进，我们所能够观察到的宇宙都有一个基本限度。
In fact there's a fundamental limit to how much of the universe we could ever observe, no matter how advanced our visual instruments.
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