Telescopes and microscopes are visual instruments.
望远镜和显微镜是光学仪器。
Then, the structure and key techniques of the visual instruments are discussed;
在此基础上对虚拟测试系统结构和关键技术进行了讨论；
In fact there's a fundamental limit to how much of the universe we could ever observe, no matter how advanced our visual instruments.
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。
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