The operation could prolong his life by two or three years.
这次手术可使他多活两三年。
Many children can't function effectively in large classes.
The results can be divided into three main categories.
结果可分为三大类。
I could come next week, or the week after.
我可能下周来,或者再下一周。
The data can be interpreted in many different ways.
这份资料可以从多方面解读。