一级理论和二级理论的区别

Ji Feng and Xiao Yuxuan stood together, just looking at each other and smiling. Tang Haiwei was so eager to show his excellence, and Liu Suhong was so helpful beside him, but he didn't know that this further exposed their superficiality. As the saying goes, a bucket full of water will not make a sound, but a bucket full of water will make a sound. This is the truth....