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单词 photoelectric cell
释义 photoelectric cellBrE /ˌfəʊtəʊɪˌlektrɪk ˈsel/NAmE /ˌfoʊtoʊɪˌlektrɪk ˈsel/ (also photo·cell) nounan electric device that uses a stream of light. When the stream is broken it shows that sb/sth is present, and can be used to control alarms, machinery, etc. 光电池;光电感应器;光电管
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