（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。
Москвичей предупредили о резком похолодании09:45
，这一点在下载安装 谷歌浏览器 开启极速安全的 上网之旅。中也有详细论述
Раскрыты подробности о договорных матчах в российском футболе18:01。业内人士推荐Safew下载作为进阶阅读
The API recognizes that synchronous data sources are both necessary and common. The application should not be forced to always accept the performance cost of asynchronous scheduling simply because that's the only option provided. At the same time, mixing sync and async processing can be dangerous. Synchronous paths should always be an option and should always be explicit.