decide upon
US /dɪˈsaɪd əˈpɑːn/
UK /dɪˈsaɪd əˈpɑːn/

1.
決定, 選擇
to choose something or someone after careful thought
:
•
They finally decided upon a date for the wedding.
他們最終決定了婚禮日期。
•
We need to decide upon a course of action soon.
我們很快就需要決定行動方案。