an unknown quantity
英 [æn ʌnˈnəʊn ˈkwɔntiti] 美 [ən ʌnˈnon ˈkwɑntɪti]

n.

未知量，难预测的事；未知数，不知底细的人（或事物）；

双语例句

1. List the given information and the unknown quantities.
   列出给定数据和未知量。
2. The method has good preciseness and less unknown variables and it is convenient to be used in practice.
   该方法收敛性较好，未知量少，便于实际应用。

权威例句

An unknown quantity
An unknown quantity
An unknown quantity
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