It should have been a simple matter to check.

检查核对本来应该是件简单的事情。

《牛津词典》

It's a very simple matter.

这是一件很简单的事。

youdao

To settle a simple matter like this won't take more than two minutes.

这点破事两分钟就办完了。

《新英汉大辞典》

Building the dam would not be a simple matter.

VOA: special.2009.08.12

It's not a simple matter. Imagine what it would be like if you had to learn about sixty such things?

绝不是个简单的事,想象一下如果你得学,六十个字母会是什么状况

耶鲁公开课 - 古希腊历史简介课程节选

I think I have sort of two things to go together that are very simple, that doesn't matter where you live.

我有两点要讲,他们都很简单,无论你住在哪里都可以。

普林斯顿公开课 - 人性课程节选

In big cities, finding a pharmacist to sell Plan B is a simple matter.

FORBES: What Pharmacist 'Conscientious Objectors' Might Learn From Boston Bombing Suspect's Nurses

As Walter Williams has explained, this is a simple matter of freedom and liberty.

FORBES: Eight Questions For Protectionists

In any case, fixing trade imbalances is not a simple matter of currency adjustment.

ECONOMIST: The yuan and global imbalances