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.
  新教师是谁现在还难以预料，但我们希望他会成为我们队里的重要一员。
• The new sales director is still a bit of an unknown quantity.
  新来的销售部主任大家还不大了解。
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