unknown quantity

• n. 难预测的人；难预料的事

英英释义

Noun:

1. a factor in a given situation whose bearing and importance is not apparent;

   "I don't know what the new man will do; he's still an unknown quantity"
   

2. a variable whose values are solutions of an equation

词汇搭配

• an unknown quantity 未知量
• unknown quantity 难预测的人

近反义词

【近义词】

• unknown 未知的