计算和值最简单方法简介：He was flipping through the book boredly, while the boys next to him were laughing. Then a teacher with glasses came in, took down the paper, handed it to the monitor to distribute, and left quickly.
He was flipping through the book boredly, while the boys next to him were laughing. Then a teacher with glasses came in, took down the paper, handed it to the monitor to distribute, and left quickly.
