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The digital input provides the load required for the circuit to work.

数字输入为此电路提供负载。

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This simple circuit made up of a source, a load and two wires is seldom, if ever, met with in practice.

这种由一个电源、一个负载和两根导线组成的简单电路，在实际中即使能碰见也是很少的。

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But where the load weighed heaviest on the social media circuit boards might surprise you.

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In a vacuum, a conventional circuit breaker -- which measures heat across a load -- doesn't work, because there, there's less or no atmosphere there to draw the heat off, so a conventional circuit breaker would trip.

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