有这样的一种说法:老外数学不好,又懒得算,于是订下了一条规矩,如果不用计算,单复数一致,such as, there is one computer for, or there are two computers for;如果需要计算不论简单复杂,不管3721一律用复数,such as, four times as many as there were two years ago. Or there are now two computers for each group, two times as many as there are two years ago. 他们到是简单了可难坏数学好的XDJM了。