学习过一些报关员需要具备的知识的翻译：Learned it wasn't required knowledge 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

Learning requires some knowledge of customs declaration

Learned it wasn't required knowledge

Has studied the knowledge which some declarants need to have

You have learned some clearance agents need to have the knowledge

Learned it wasn't required knowledge