He still has a serious problem with money.

他在金钱方面还存在着严重问题。

《柯林斯英汉双解大词典》

As you rightly say, we have a serious problem.

你说得对，我们有严重困难。

《牛津词典》

In 'Luckily, I didn't tell anyone' and 'Financially, we have a serious problem', 'luckily' and 'financially' are sentence adverbs.

在句子Luckily, I didn't tell anyone和Financially, we have a serious problem中，luckily和financially是句副词。

《牛津词典》

Most scientists agree that climate change is a serious problem that requires the attention of people and governments around the world.

VOA: special.2009.06.03

And off he goes, and he sulks in his tent for the next nine books, and this turns out to be a serious problem for them.

然后他真就走了,他回到自己的帐篷收拾东西,他这一走 问题就大了

耶鲁公开课 - 古希腊历史简介课程节选

So we learned the very first time that in the Prisoner's Dilemma communication per se won't help, but in the coordination problem, which could be just as serious socially as a Prisoner's Dilemma, in a coordination problem it may well help.

在第一讲里我们就学到了,在囚徒困境中沟通不起作用,但是在和囚徒困境具有,同样重要社会意义的协和谬误中,交流却能够起到作用

耶鲁公开课 - 博弈论课程节选

China is also unique in encountering a serious problem with aging while still a poor country.

WSJ: Aging Chinese Face a Bleak Picture

Dropping out remains a serious problem at the secondary level, especially among racial and ethnic minorities.

UNESCO: II Part Analytic Section

To my surprise, I had a serious problem that had not been evidenced by any symptoms.

CNN: 'Robots helped treat my prostate cancer'