If we want to report news in depth, the use of background materials is unavoidable.

深度报道离不开背景材料的运用，而运用的关键又在于叙述分寸的把握。

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Another technical challenge is keeping Buzzword's user interface responsive without the use of background threads.

另一个技术挑战是不使用后台线程来保持Buzzword的用户界面响应能力。

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Apple restricts the use of background services that use the network, GPS, and other phone-related resources, in order to conserve battery life.

苹果限制用到网络、GPS及其他与通话相关的资源的后台服务的使用a，以便节省电池寿命。

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That said, vendors need to address the mainstream use case of background media functions and location services for third parties to truly make their platforms valuable to users.

ENGADGET: Entelligence: Mobile multitasking is mostly a myth

Gun-control advocates have helped highlight these flaws, but some also worry that focus on the system's holes will be used as an excuse to block legislation requiring universal use of the background check system.

WSJ: Systemic Gaps Hinder Background Checks for Gun Purchases

The proposals include requiring the use of mental-health records as part of background-checks that are sometimes conducted when someone buys a gun.

WSJ: Conn. Gun Fight Continues