I am deeply concerned by this development.

我对这一事态深表担忧。

youdao

Robinson: You just do not seem concerned by this, Mike.

Robinson：你似乎对此根本就不关心嘛，Mike。

youdao

Experts are concerned by children's increased use of mobile phones.

专家们十分关注儿童手机使用量增长的问题。

youdao

Even before the violence, hotels in Bangkok reported that 20 percent of their reservations were being canceled by travelers concerned by the protests.

VOA: standard.2010.04.12

They now face perennial power Brazil, a four-time champion at this level, but Tetteh says he is not concerned by the formidable opponent.

VOA: standard.2009.10.15

"And the problem is, most Muslims do not feel concerned by the burqa."

VOA: standard.2010.01.30

Western countries are concerned by Hamas' refusal to renounce violence and recognize Israeli statehood.

NPR: Russia, Hamas and the United States

Members are concerned by a sharp drop in numbers in recent years, against growing demand.

BBC: An electrician and his apprentice

"I'm very concerned by the union of mobile tracking and face recognition, " he said.

WSJ: Police Adopting iPhone-Based Facial-Recognition Device by BI2, Raising Civil-Rights Questions