In such cases, a simple re-arrangement and an additional power supply permit reading positive current.
在这种情况下，简单地重新安排电路，并使用一个附加的电源就能获得正电流。
The hospital has an additional electricity supply standing by in case of a power failure.
医生另有一套供电设备以防万一停电时使用。
The hospital has an additional electricity supply standing by in case of a power failure.
医生另有一套供电设备以防万一停电时使用。
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