During commercials, an overlay will appear at the bottom of the screen, prompting viewers to press a button to request a free sample or order a catalogue.
2016年6月六级真题(第三套)阅读 Section C
柯林斯高阶英汉双解学习词典释义
N-UNCOUNT
鼓励;敦促;驱使;怂恿
If you respond to prompting, you do what someone encourages or reminds you to do.