Just like the mailouts system, the front end USES add , and the processing engine USES get_all and delete .

与mailouts系统一样，前端使用add，处理引擎使用get _ all和delete 。

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The Groff distribution includes the groff front-end tool, the troff back-end typesetting engine, and various adjunct tools, which are used in this tutorial.

Groff 分发版中包括 groff 前端工具、troff 后端排版引擎和本教程中使用的各种附属工具。

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If you're looking for a rule of thumb, here's one that seems to work well: for most games, each single front-end server can keep at least four game-engine servers busy.

有一条经验规则：对于大多数游戏，每台前端服务器可以让至少四个游戏引擎服务器达到饱和。

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The car itself had its entire front end sheared off, with the burning engine wedged through a gaping hole in the fence.

NPR: Fans Injured When Car Sails Into Fence At Daytona

Facebook is just the front end -- the consumer interface -- of a big data engine.

CNN: The joke may be on Zuckerberg

The entire front end was sheared off Larson's car, and his burning engine wedged through a gaping hole in the fence.

NPR: Horrifying Crash At Daytona Exposes Risks To Fans