1. The tower, with a square base, reminds us of a fort tower and it is not known whether it was a belfry, an observation tower, or both at the same time. 塔的地基为正方形，使我们想起了一座堡垒，只是不知道它是钟塔还是观察塔或者两者都是。
2. On the aspect of observation time, it has limited efficiency for low earth orbit target space-based observation, and good efficiency for high earth orbit observation. 在可见时间方面，天基空间目标光学监视系统对低轨目标的监视能力有限，而对高轨目标具有良好的监视性能。
3. The progress of research on in situ observation technique for crystal growth in resent years is reviewed. It includes microscopical observation and optical interferometry observation. 综述了近些年来晶体生长过程中实时观测技术的方法和内容，主要包括显微镜观测和光学干涉法观测；
4. The progress of research on in-situ observation technique for crystal growth in resent years is reviewed. It includes microscopical observation and optical interferometry observation. 综述了近些年来晶体生长过程中实时观测技术的方法和内容，主要包括显微镜观测和光学干涉法观测；
5. On the aspect of observation time, it has limited efficiency for low earth orbit target space-based observation, and good efficiency for high earth orbit observation. 在可见时间方面，天基空间目标光学监视系统对低轨目标的监视能力有限，而对高轨目标具有良好的监视性能。
