martwiący się o 英語で:

The Grants' became concerned about their daughter's sanity and health.

People are concerned about global warming.

Yes the time capsule's items date from over 200 years ago, so the historians are concerned about opening it. The newspapers particularly might have deteriorated, decayed or decomposed over time.

I’m concerned about his eyesight.

My father is very concerned about my future.

I'm very concerned about the environment.