"unknown quantity" in Chinese (Traditional)
未知數未知的人物
Definition
能力、影響或結果尚未得知的人或事物；也指因資訊不足而無法預測的事物。
Usage Notes (Chinese (Traditional))
多為半正式用語，常用於形容影響未明的人或事。可以指新人、競爭者或不確定的因素。一般在日常語境下不指數學上的『未知數』。
Examples
Until we see him play, he's really just an unknown quantity.
在我們看到他表現之前，他真的只是個**未知數**。
The new teacher is still an unknown quantity to us.
新老師對我們來說仍然是一個**未知數**。
He is an unknown quantity in this competition.
他在這場比賽中是一個**未知數**。
The weather is always an unknown quantity here.
這裡的天氣總是個**未知數**。
Bringing in a player from another country can be an unknown quantity for the team.
從國外引進一名球員對球隊來說可能是個**未知數**。
How the new policy will work out is still an unknown quantity.
新政策會如何實施仍然是一個**未知數**。