print("average length: {average}");
total = total + records[i].value;。业内人士推荐新收录的资料作为进阶阅读
，更多细节参见新收录的资料
治安案件的管辖由国务院公安部门规定。，详情可参考新收录的资料
Mog’s Result and Optional (?T) types have variants that match can destructure. This is a brief preview — Chapter 10 covers error handling in depth.