If your connection is disrupted or if your browser is closed, you cannot necessarily rely on the callback mechanism to fire when the service is complete.

如果您的连接是混乱的，或者您的浏览器关闭了，那么在服务完成时，您将不能依赖回调机制来触发。

youdao

Model 07-S should be installed at the fire sprinkler service connection to the main line.

型号07-S应该安装在连接到主管道的消防喷淋系统处。

youdao