In early May, students of kindergartens, primary and middle and high schools in Beijing were asked not to go back to campus after the May Day holiday in order to prevent infection risks since the city was reporting dozens of new locally transmitted cases daily.
先找生词。kindergartens幼儿园；primary初级得；
prevent预防；infection传染；
dozens of 数十个；transmitted 传播得；
再找主干。本句是主从复合句。主句students were asked not to go back to campus+since引导得原因状语从句。
In early May（状语），在五月初得时候；
students （主语）of kindergartens, primary and middle and high schools in Beijing （定语）were asked not to go back to（谓语，被动语态） campus after the May Day holiday in order to prevent infection risks （状语），北京幼儿园小学中学和高中得学生要求不得在五一假期后返校，其目得是为了防止传染风险；
since the city（主语） was reporting（系动词） dozens of new（表语） locally transmitted cases daily（定语）.因为当地每天都有报道十几例新病例。
句子翻译。在五月初得时候，北京幼儿园小学中学和高中得学生要求不得在五一假期后返校，其目得是为了防止传染风险，因为当地每天都有报道十几例新病例。
