What I'll use is the second row this time, and I'll get four of you to each yell out a two-digit number, and if you would square the first number, and if you would square the second, the third and the fourth, I will try and race you to the answer. OK?
这次我选第二排的4个观众 -- 1个，2个，3个，4个 -- 每人喊出一个2位数的数字， 然后你来平方第一个数字， 你来平方第二个，以此类推，第三个和第四个。 我们来比看谁算得快，好吗？