【文章內(nèi)容簡介】 play games. We sang, danced, told jokes and played sketches in the classroom... Everyone had a great time. Finally, after school, we packed up and went home with our parents.　　The annual International Children’s Day is ing. The students are all dressed up and happy, because this is the first children’s day when we enter primary school.　　The program began in our hope. First of all, the uncles and aunts of the choir brought us a chorus. They are full of energy and have a loud voice, which set an example for the students. Then there are the Dances “a good start” and “l(fā)ittle white boat”... The programs are more and more wonderful. Soon, the dream chasing angel of our class will play, and I’m nervous and excited. Under the mand of the teacher, we went to the designated position to prepare. Shi Muran and I led the dance. Our preparatory action was to kneel on the ground with both legs. A few days ago, I broke two knees. Although I had a few days’ rest, the wound has not fully healed. I’m really worried that the wound will crack again. Sure enough, as soon as I knelt on the ground, my legs began to ache violently. My eyes were so hot that I almost cried. At this time, I thought of my mother’s words: “child, you must be strong, no matter how painful you have to hold back, and you must finish the show with a smile.” So I clenched my teeth and opened my eyes, but I didn’t let my tears flow out. When the music sounded, I finished the whole performance with my classmates with a smile. After the performance, I saw my mother with tears in her eyes. My father gave me a thumbs up and the teacher nodded to me.　　This is really an unforgettable June day, because I learned to be strong.　　”61” International Children’s Day is a day that truly belongs to our children. On this day, we can do what we want freely. But today, I really tasted the hardships on the road to knowledge.　　I am honored to be chosen by the teacher to do the experiment. The experiment I did was called the balloon of catching objects. A balloon that catches objects, as its name suggests, is a balloon that can catch an object. This experiment uses the thermal expansion and contraction of gas: first find two plastic cups, one with some hot water and the other with some cold water。 Find another balloon and blow it up。 Finally, find a container. In this way, the preparations for the experiment are ready. Next, we started the experiment. First put the cup containing hot water in the container, and then block the balloon tightly on the mouth of the cup. Then, pick up the cup containing cold water and pour it evenly on the surface of the balloon to cool the air in the balloon at once. In this way, the balloon will shrink into the cup。 Finally, lift the balloon up again. In this way, the cup and water are caught by the balloon.　　That afternoon, I went to the designated place and started the experiment. I followed the steps and did it steadily without taking it lightly. After a while, the videographer came. I panicked, deflated the balloon and made the loose buckle