外部设备——例如，通用串行总线(usb)端口或系统时钟。
External devices — For instance, Universal Serial Bus (USB) ports or the system clock.
第一批完全由环境能量供电的设备很可能是传感器、计算器和时钟。
The first devices to be powered entirely by ambient energy are likely to be sensors, calculators and clocks.
一些设备有两个时钟，一个用于“捕获”或者“显示”数据，另一个则用于提供将数据输入器件的时序。
Some devices have two clocks, one to "capture" or "display" data, and another to clock it into the device.
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