An instrument in which a mirror is automatically moved so that it reflects sunlight in a constant direction.It is used with a pyrheliometer to make continuous measurements of solar radiation.
定日镜一种仪器,装有一面会自动调控
镜子,以

朝某一恒定方向反射日光。
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But while a spacesuit could protect lunar tourists against the vacuum of space, a lack of oxygen, temperature extremes, and lethal solar radiation, a potential hazard that spacesuit would do little to protect against, is high-velocity micro-meteorites.
即使太空服
以对付月球
真空。月球上缺乏氧气、温度极端、还有致命
太阳辐射,但是太空服提供
有限
保护还是无法避免

危险,就是高速
微小陨石。
级英语短文