The chemical reaction equation strictly abides by the law of conservation of mass. After writing the chemical reaction equation, the number of atoms on the left and right sides is often unequal, which does not conform to the law of conservation of mass. This needs to be solved by calculating the balance.

On June 9th, 20 19, "Youth School" premiered in Golden Eagle Solo Theater of Hunan Satellite TV, and was broadcast simultaneously on iQiyi, Tencent Video, Mango TV and Youku Video. The play mainly revolves around four families, and tells the story that family members struggle hard under the sunshine and rain, and finally grow up.