I regard this as a serious matter.

我认为这是一件重要的事情。

《柯林斯英汉双解大词典》

Certes this is a serious matter.

这实在是一件严重的事情。

youdao

Sometimes a young child may get over-excited and be a little too rough, but it's never a serious matter.

有时一个小孩子可能会过于兴奋和有点过于粗暴，但这从来都不是一个严重的问题。

youdao

"Don't ask, don't tell" -- repealing "don't ask, don't tell" is a serious matter.

WHITEHOUSE: Press Briefing by Press Secretary Jay Carney,

The existence of corruption at the heart of the finance ministry is a serious matter.

ECONOMIST: In Japan, he went

But the ICC decided to enforce the suspension with Richardson adding, "corruption is a serious matter".

BBC: Suspended Samuels set to appeal