paper test card

• 测试卡

paper test card的用法和样例：

例句

1. Each channel had a unique themed test card.
   每个频道都有各自不同主题的测试卡。
2. The test card was transmitted by television companies at times when viewers weren't supposed to be watching.
   电视台会在用户收看电视的低峰时段传送图像测试卡。