The bell rang, the Chinese teacher came, and the classroom suddenly lost power, which surprised all the students. It was a morning in June, having an early reading class. Although the weather was gloomy and sultry, eight fluorescent tubes lit up the classroom and four flying fans blew cool. The bell rang, the clouds cleared and the sunlight and lights competed with each other, but more than forty students were ignored. Eight lamps in the classroom were turned off, but the students didn't respond, but the teacher turned off four flying fans, which surprised the students. The teacher began to teach us casually, and we didn't know what medicine the teacher was selling, so we had to listen carefully. The teacher spoke vividly in class, with sweat oozing from his forehead and a thin shirt sticking to his body. It was really difficult! Although we sat listening to the class, we kept sweating. Everyone wants the fan overhead to turn, but we all want time to pass quickly. The teacher wiped the sweat on his face and pressed the switches of the four fans. We finally heard the bell, which made us feel cool. The teacher said seriously, "Do you know why we had a lesson on listening to electricity just now?" The sun shines on the lights. Why didn't any students turn off the lights? This not only wastes the school's electricity bill, but also wastes the power resources. At present, many factories are shut down for lack of electricity, and many places are short of electricity and use electricity at peak times. We ... "While I was meditating, the teacher left the classroom. We will never forget this section. The teacher's sweat is fragrant, and the peaches and plums watered by sweat must be fragrant all over the world.