The reason for the event? It's aim is to raise awareness of energy efficiency and demonstrate that people, working together, can make a difference in combating climate change.
而这项活动的目的又是什么呢？它主要是为了向人们宣传节约能源，提高人们的意识。此外，它还号召人类共同努力，应对气候变化。
In the long-term work, he found that the conversion using the traditional method of low efficiency, cost him a lot of time and effort, so he wanted to change his working methods to improve efficiency.
在长期的工作中，他发现，采用传统的转换方法，效率较低，耗费他大量的时间和精力，所以他想改变他的工作方法，以提高工作效率。
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