1、为
... concern oneself with 研究的对象是。。。 concerns over 为。。。担心（忧虑） confer sth。 on sb。 把。。。赐予（授予） ...
2、担心
... concern oneself with研究的对象是... concerns over为...担心 confer sth. on sb.把...赐予 ...
Concerns over free expression涉及自由表达
show great concerns over对
loud expressing concerns over大声疾呼
Concerns Over Side Effects担心副作用
concerns over reality社会现实
has again raised concerns over再一次引起对„„的担忧;再一次引起对……的担忧