Computers can do a great deal of work in a short time,but a man can not do much by himself 这里为什
问题描述：
Computers can do a great deal of work in a short time,but a man can not do much by himself 这里为什
么要用computers 而不用computer，区别在哪里？
答
恩,是泛指 要么用 a computer 要么用 computers 这种一般名词的单数一般是不能单独出现的,要么加个冠词 要么就用复数