unknown quantity

常见例句

• The new teacher is still very much an unknown quantity but we have hopes that he will be a valuable member of our team.
  新教師是誰現在還難以預料，但我們希望他會成爲我們隊裡的重要一員。
• The new sales director is still a bit of an unknown quantity.
  新來的銷售部主任大家還不大了解。
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