（二）业务之间具有明显的主附关系。主要业务居于主体地位，体现交易的实质和目的；附属业务是主要业务的必要补充，并以主要业务的发生为前提。
Mitchell Hashimoto Co-founder, HashiCorp，这一点在雷电模拟器官方版本下载中也有详细论述
Москвичей предупредили о резком похолодании09:45。旺商聊官方下载对此有专业解读
Dr. John Ackerman, an expert on youth suicide prevention who was not involved in Instagram's alert feature, told Mashable that it appeared to be carefully considered. Instagram said it relied on feedback from a group of experts it assembled on suicide and self-harm. (Instagram does not publicize the members of its advisory group.)