老师进来前，请把黑板擦干净。的翻译：Before the teacher came in, please clean the Blackboard. 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Teacher came before the blackboard clean.

Before the teacher came in, please clean the Blackboard.

Front teacher comes in, please dry the blackboard only.

Teachers come in before the blackboard, Please wipe it clean.

Before the teacher came in, please clean the Blackboard.