to express worry or doubt about an issue
对某个问题表示担忧或怀疑 (dui mou ge wen ti biao shi dan you huo huai yi)
"Activists raised concern about the pollution levels in the river."
"活动家们提出了关于河流污染程度的关注。" (huo dong jia men ti chu le guan yu he liu wu ran cheng du de guan zhu)
to focus on the positive aspects of a situation
to move forward positively despite difficulties
to start speaking suddenly, often interrupting others
to register or enroll in a course or activity
to gain knowledge or understanding through experience or obs...
to visit someone's house
