The weakness of usual portable clock model is pointed out and a new model considering the rate between portable clock and standard clock is given.

指出了常用搬运钟法计算模型中存在的不足，给出了考虑搬运钟与标准钟速率差的计算模型。

youdao

Central Standard Time, two o'clock Eastern Standard Time, some thirty-eight minutes ago."

VOA: special.2009.08.16

While the DVI standard limits TMDS clock rates up to 165MHz, the HDMI 1.4 specification allows TMDS clock rates up to 297MHz, enabling the support of 1080p 3D at 60Hz, or Ultra HD (4K x 2K) up to 30Hz frame rate.

ENGADGET: VESA outs latest DisplayPort Dual-Mode 1.1 standard with 4K HDMI support

The clock tower was used to set a standard time.

UNESCO: Culture

Imagine your standard cubicle inhabitants, tasked with hacking the future against the clock.

FORBES: Hack Your Way to a Better Future