毕业论文的摘要不知道怎么翻成英文，不要拿谷歌翻译糊弄人啊，要翻译的在下面：

The design mainly focuses on the library lighting system controled by PLC . In this system, temperature senser and light sensetive electric resistor is used to collect and input data, and then the data is transformed to PLC. PLC is designed to control the library lighting system‘s on and off ，so as to reduce electric energy

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