unknown quantity
US /ʌnˈnoʊn ˈkwɑntɪti/
・UK /ʌnˈnəun ˈkwɒntəti/
B2 中高級
n. phr.未知數，難以預測的人
The new player is an unknown quantity for the team this season.
影片字幕
緬因州民主黨尋找參議院新參選人 | DW 新聞 (Maine Democrats looking for new Senate candidate | DW News)
- Rather, it's turned into a case study of how the wider party can give voters what they want, balancing the desire for a non-establishment figure to shake things up with the dangers of putting forward an unknown quantity.
相反地，這變成了一個案例研究，探討整個黨如何能給予選民想要的，平衡選民希望非建制派人士能帶來改變的願望，以及推出未知數的風險。