As you rightly say, we have a serious problem.

你说得对，我们有严重困难。

《牛津词典》

Crime is an increasingly serious problem in Russian society.

犯罪是俄罗斯社会一个日益严重的问题。

《柯林斯英汉双解大词典》

Bullying is a serious problem at school.

校园霸凌是一个严重的问题。

youdao

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

In many ways for Aristotle as it is for every student of politics the most serious the most difficult issue one confronts is the problem of faction.

从很多方面看来，无论是对亚里士多德,还是每位政治系的同学而言,最令人最感严肃,与严重的问题,是派系的问题。

耶鲁公开课 - 政治哲学导论课程节选

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

WSJ: Aging Chinese Face a Bleak Picture

The substantive, more serious problem, is that revenue target of 19.1 percent of GDP.

FORBES: Taxes and Paul Ryan's Budget: What's Clear, And What Isn't

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

UNESCO: II Part Analytic Section