商务英语：今日热词——未知数

鉴别

(verb) To confirm that something is genuine by a formal process that often involves careful analysis or an expert's opinion.

例句

EXAMPLE: The bank has a complicated process it uses to authenticate the signature of customers on checks.

银行有一个复杂的程序来鉴别客户在支票上的签名。

未知数

An unresolved issue; any matter involving contrasting opinions that has not been decided.

EXAMPLE: Competition is fierce between the two rivals, and who will win is still completely an open question.

两个对手之间的竞争非常激烈，谁能获胜还完全是个未知数。