I got to know his worry and concern.
我得知道他的担心和关心。
This is always the major concern and worry of our clients.
这个总是客户们担忧的。
Thank you very for your concern and sorry for giving you so much worry.
非常感谢你们的关心，很抱歉让你们担心了。
Thank you very for your concern and sorry for giving you so much worry.
非常感谢你们的关心，很抱歉让你们担心了。
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