问题 one hundred和a hundred有什么区别

one hundred和a hundred有什么区别在表示数字的时候，这两个用法有什么区别吗？

话题 a day or two

话题 a great quantity of

话题 twice in a day

话题 a place to live

话题 a page of photos

话题 a pair of hands

话题 go for a row

话题 go for a rowing

话题 a great many of

话题 a tough few months

话题 a bit of me

话题 a historian of science

话题 from a year ago

话题 have a hard time