演讲者使用麦克风来提高声音的放大效果。

The speaker used a microphone for better ___amplification of his voice.

教授要求学生对论文进行扩充，添加更多案例来加强论点。

The professor asked students to provide ___amplification to their essays by adding more case studies.

新闻媒体的报道往往会放大公众对事件的关注度。

News coverage often leads to the ___amplification of public attention to events.