It has an aluminized surface that reflects starlight to form an image at the focal plane.
表面镀铝膜，将星光反射到焦平面上成像。
The results indicate that with the increase of focal length, the intensity distribution on the focal plane varies from central-dip form to Gaussian distribution.
结果表明：随着聚焦距离的增加，焦面光强分布由中央凹陷状向高斯分布转变。
The focal points of the course, however, is not prominent; the form of listening training seems still simplistic, the author comments.
但也存在着重点不突出，听力训练形式单一等问题。
The focal point is to analysis the main way of environment in geography teaching and main form of developing environment education.
重点分析地理教学中环境教育的主要途径和开展环境教育的主要形式。
The focal point is to analysis the main way of environment in geography teaching and main form of developing environment education.
重点分析地理教学中环境教育的主要途径和开展环境教育的主要形式。
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