鑒別

(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.

銀行有一個(gè)復(fù)雜的程序來鑒別客戶在支票上的簽名,。

未知數(shù)

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.

兩個(gè)對手之間的競爭非常激烈,，誰能獲勝還完全是個(gè)未知數(shù)。