Chapter 2 describes the system part of MPEG-2 standard with focuses on PSI (Program Specific Information) and PCR (Program Clock Reference).

第二章主要讲述了MPEG - 2标准系统层规范，着重介绍节目特殊信息PSI和节目时钟参考pcr。

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"We are all concerned about Iran running out the clock on us on their nuclear program,".

VOA: standard.2009.09.17

Pivot will program around the clock (no long-form infomercials padding fringe periods).

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The NYPD is not being tremendously forthcoming about what the round-the-clock, massive surveillance program entails.

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Not surprisingly, according to one Harvard expert, Medicaid overpayments routinely clock in at 6-7 percent (based on official government audits) and the program is rife with fraud.

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