a question about bulk importing .sql files

[xie xie]

I have serveral .sql files,i want to use mysqlshell to bulk import those .sql files into mysql，so i first connect root@localhost:3306,then i use the command:"\source C:\sip\main.sql" to import,but mysqlshell shows:"syntaxerror unexpected identifier ‘C’",the main.sql file consist of many lines like"source C:\sip\001.sql","source C:\sip\002.sql" and so on.mysqlshell‘s version is 8.0.34，mysql's version is 5.7.43.0.
what is the problem?how to solve it?thank you.