劍橋詞典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 測(cè)試圖案（電視臺(tái)播放的圖片或圖案，用于檢測(cè)或改進(jìn)圖像質(zhì)量） 返回 test pattern