为了扩大知识面，提高教学水平的翻译：In order to increase their knowledge, improve teaching level 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

In order to expand knowledge, improve the teaching level

In order to increase their knowledge, improve teaching level

In order to expand the aspect of knowledge, raises the teaching level

In order to expand their knowledge, raising the standard of teaching

In order to increase their knowledge, improve teaching level