The time in which equipment is in actual use, such as production time, incidental time, development time (program), etc.

指实际使用设备的时间，例如生产时间、附随工作时间、程序开发时间等等。

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That the computer won is remarkable--but at the same time almost incidental.

FORBES: Magazine Article

Since the day Shakespeare died, people have been adapting his work to their own time by writing incidental music for the plays.

NPR: Barenaked Ladies Meet Shakespeare

The Bill, which has been on air for 25 years, is being comprehensively overhauled, including an end to its well-known theme tune and the use of incidental music for the first time.

BBC: Schedule shake-up affects Corrie