1、an equation in which the highest power of an unknown quantity is a square.
未知量的最高冪是平方的等式。

2、an equation in which the highest power of an unknown quantity is a square
未知量的最高冪是平方的等式。

3、The Frenchman was an unknown quantity when he arrived in north London back in 1996.
1996年，當(dāng)他初到北倫敦時(shí)，這個(gè)法國人還只不過是個(gè)未知數(shù)而已。

unknown quantity翻譯