Since it cannot be retrieved in the specified waiting period, a pop-up window informs the user about the background processing.

因为在指定的等待周期内无法获取它，一个弹出式窗口告诉用户获取操作在后台继续执行。

youdao

Therefore, the HTTP requests can be made and responses received completely in the background and without the user experiencing any visual interruptions.

因此，可以在后台发出HTTP请求和接收响应，而不会给用户造成任何视觉上的干扰。

youdao

When the user clicks that icon, a request goes in the background to the server with information about which box the user wants to subscribe to.

当用户单击此图标时，一个请求将在后台发往服务器，其中带有用户希望订阅的对话框的相关信息。

youdao

From then on, any time the user clicks on a Web site, program or database that requires its own user ID and password, the software issues the proper credentials, all in the background, without the user having to lift a finger or remember a word.

FORBES: Magazine Article

These actions can occur in the background while the user is seeing what appears to be a normal, harmless web page.

FORBES: When QR Codes Go Rogue

Photos from any of these locations can be enjoyed in slideshow mode simultaneously with music stored on the device or streamed from the user's PC in the background.

ENGADGET: HP's new DreamScreens pack Pandora and Facebook into a wireless photo frame