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External devices — For instance, Universal Serial Bus (USB) ports or the system clock.

外部设备——例如，通用串行总线(usb)端口或系统时钟。

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Every day we jump out of bed with the earsplitting ring of the alarm-clock, swallow a quick breakfast and then rush to catch the bus.

每天我们闹钟一响就起床，迅速地吞下早餐后就去赶公交车。

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Just outside Buchanan Street bus station in Glasgow is a clock standing on tall legs.

BBC: Public art: What is it for?

Things like the number of computer instructions per clock cycle, the bandwidth of the RAM bus, and the overall efficiency of the architecture are at least as important as the raw clock speed at which a processor runs.

FORBES: Nintendo Wii U Clock Speeds: Much Ado About Nothing?

In 2000, when McCain competed against George W. Bush for the Republican Presidential nomination, the bus was a stage for his around-the-clock monologues with the press corps.

NEWYORKER: On the Bus