Power supply to DCS shall be from two different sources, Vital A (UPS) and one essential (backed up by diesel generator) or Vital B (UPS).
到DCS的电源应来自不同的两路电源， 至少有一路引自UPS，另一路可由柴油发电机备用或者也引自UPS。
If you are creating a movie that explains something, it is very common to use B-roll to provide close-ups of the thing you are explaining.
如果生成的电影要解释某个东西，则经常用B卷对要解释的东西提供特写。
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