test card

名词 n.
中文释义

英文释义

名词 n.
  1. A card printed with various letters or symbols, used in testing vision.
  2. A test signal, typically broadcast at times when the transmitter is active but no programme is being broadcast (often at startup and closedown). UK
    — In 1967, the BBC needed a ‘test card’ for its new colour broadcasts, to be put on the screen when programmes were not being transmitted so engineers could adjust the quality of the picture.

词形变化

test cards plural
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