noun[ C ]USuk/ˈtest ˌpæt.ən/us/ˈtest ˌpæt̬.ɚn/(UK test card)
测试图案(电视台播放的图片或图案,用于检测或改进图像质量)
a picture or pattern that is broadcast so that the quality of the television picture received can be examined and improved if necessary by using the controls on the equipment