随着讨论的进行，他们之间的分歧更加深化了。

As the discussion went on, the disagreement between them ___deepened.

他在调音台上调整了设置，使背景音乐的音色更加深沉。

He adjusted the settings on the mixer to ___deepen the tone of the background music.

农民们需要加深水渠以便更好地灌溉田地。

The farmers need to ___deepen the ditches for better irrigation.

阅读这本小说加深了我对历史背景的理解。

Reading this novel helped me ___deepen my understanding of the historical context.