In general, when we wanna talk about running time, we just need a silly place holder, so we'll call it T for time.

一般情况下，当我们讨论运行时间时，需要一种表示方法，这里T表示时间。

哈佛公开课 - 计算机科学课程节选

It also makes employees do an hour of voluntary work a week, helping children and adults with basic reading and arithmetic, running anti-drugs programmes and training people for call-centre work.

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But the sizzle can enliven its musty mainline business of running computer systems, call centers and data-entry operations for the likes of ChevronTexaco and Blue Cross Blue Shield.

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And, running the risk of alienating fellow Democrats, Clinton will call anew for so-called fast-track authority to negotiate international trade deals.

CNN: State Of The Union