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coelostat

/'si:lә,stæt/

📖 中文释义

  1. n. [天]定天镜( 观测或拍摄天体时镜面与地轴一同转动可使图像固定不动)
📘 English Definition（英文释义）
  1. n optical device used to follow the path of a celestial body and reflect its light into a telescope; has a movable and a fixed mirror
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