什么叫四则混合运算定律

简介：Su Can had nothing to do in the afternoon, but Cheng Keshu had to go to class, so Su Can went to the business school to observe, and sat next to her to accompany her, which almost caused the anger of both men and gods. At least 30% of the boys in the public lecture theater were hostile to him. They snatched away the goddess of our college when they came up. Why aren't we allowed to be angry?