如果你实现了上述两点，你还需要一个控制每个二极管的驱动，这意味着需要更多的电路和固件。
Once you've got that, you also need a driver to control the individual diodes, which means additional circuitry and firmware.
企业通常都会作这样设置，主要基于以下两点原因：控制用户的更新源，通过限制搜索范围提高性能。
An enterprise typically disables this preference for two reasons: to control the source of updates for their users or to improve performance by limiting the search scope.
偏压，在控制电路的两点之间的电位差。
BIAS, The potential difference applied between two points for controlling a circuit.
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