finishing touch
US /ˈfɪn.ɪʃ.ɪŋ tʌtʃ/
UK /ˈfɪn.ɪʃ.ɪŋ tʌtʃ/

1.
點睛之筆, 畫龍點睛
a final detail or improvement that completes or perfects something
:
•
Adding the small decorative vase was the perfect finishing touch to the room.
加上那個小裝飾花瓶是房間完美的點睛之筆。
•
The artist added a few more brushstrokes as a finishing touch to the painting.
藝術家又添了幾筆,作為畫作的點睛之筆。