動詞是deepen，例如：
1、Asking juicy questions appears to be a transferable skill for deepening collaborative inquiry into the science content found in exhibits.提出有趣的問題似乎是一種可以轉移的技能，能夠深化針對展品中發現的科學內容的協作性研究。
2、There were plans to deepen a stretch of the river.曾經有過加深一段河道的計劃。
3、The gloom deepened as the election results came in.選舉結果陸續傳來，失敗的情緒越來越重。
