对什么感到很担心 Be concerned about
感到很担心
Feel very worried
以上为机器翻译结果，长、整句建议使用 人工翻译 。
当那个职员回到公司时，她感到很担心。
When the clerk went back to the company, she felt really worried.
youdao
很久没收到你的信，我感到很担心。
As I have not heard from you for long.
我们当然感到很担心。
Of course, we are very much concerned.
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