定日镜是一种跟日聚光装置，是塔式太阳能热发电系统中的关键设备。
The heliostat is an important kind of equipment in the tower power generation system, which is used of tracking the sun and collecting the solar energy.
在聚光太阳能热利用设计时，有必要计算聚光装置倾斜镜面或孔径表面的太阳直接辐射。
It is necessary for calculating the solar beam radiation on the tilted mirror or aperture for designing of solar thermal utilization.
如果把意识知觉当做一个聚光灯，那么潜意识就是它的控制装置，决定灯光什么时候打开，把光束指向哪里。
Think of consciousness as a spotlight, with the subconscious controlling when to turn it on and where to direct the beam.
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