or在作“也不”解时通常用于否定句; 作“还是”解时常用于疑问句。
The operation could prolong his life by two or three years.
这次手术可使他多活两三年。
She always had one or two students boarding with her.
她的家总有一两名寄宿学生。
How much will it cost, more or less?
这个大概得花多少钱？
Is this a social visit, or is it business?
这是社交性的'拜访，还是业务性的？
I could come next week, or the week after.
我可能下周来，或者再下一周。