????:1????????:??????sn

2?????q

3?????????

4???????????????

5?????????

???????? ?? ?? ????

“??”? “?????”??

?

????????????

?? 1/11

2????????????15???,??“?????????????”,??“??”“??”??“?????????????”“?”?2??16???????“?????”(??????????)????“??????????????”?

???:????

?? ?