我们已经完成了初步的调查工作。

Wǒmen yǐjīng wánchéngle chūbù de diàochá gōngzuò.

We have completed the preliminary investigation work.

我们对这个问题已经有了初步的了解。

Wǒmen duì zhège wèntí yǐjīng yǒu le chūbù de liǎojiě.

We have a preliminary understanding of this issue.

这是我们初步的计划草案，请大家审阅。

Zhè shì wǒmen chūbù de jìhuà cǎo'àn, qǐng dàjiā shěnyuè.

This is our preliminary draft plan, please review it.