Recently the problem between parents and children has become more and more serious.

最近，父母和孩子之间的问题变得越来越严重。

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As is reported in the newspaper, the air pollution in some big cities, such as Beijing and Wuhan, has become more and more serious.

正如报纸上所报道的，北京和武汉等大城市的空气污染已经变得越来越严重。

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Background: Depression has become more and more serious problem in public sanitation.

背景：抑郁障碍已成为日益严重的公共卫生问题。

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The initiatives have since become more serious and are being led by Google's "access" unit, the Google X lab led by Google co-founder Sergey Brin, and Google.org, the company's nonprofit arm, these people said.

WSJ: Google to Fund, Develop Wireless Networks in Emerging Markets

And matters could become far more serious than a mere loss of voters' support.

ECONOMIST: Venezuela

Issues become more complex upon setting the jokes aside and considering serious economic and environmental concerns.

FORBES: When Washington Fails a Cost-Benefit Test