??????????
???????????????lv2????????lv2?????lv2??????lv2???????lv2?????lv2????????lv2?????lv2?????lv2?????lv2?????lv2?????lv2?????lv2??????lv2??Σ????lv2??????lv2??????lv1??????lv2?????lv1??????lv2????????lv2??????lv2?????????lv2?????lv1??????lv1?????lv2??????lv1??????lv3?????lv1????????lv2??????????lv1?????lv1????????lv1??????lv1?????lv1??????lv1?????lv2?????lv2??????lv3?????????lv3???e???lv2?????????lv2??????lv1?????lv1????lv1?????????lv2?????????lv1???滭lv1?????????lv3?????????lv2??????????lv1