anxiety 指对预料中的不祥之事的焦虑。
worry 侧重对未知事态演变的忧虑。
care 强调因出于责任感或顾虑等而产生的不安。
concern 作“关心”用时，是indifference(冷漠)的反义词，侧重对他人健康、安全等的关心，也可暗示对困难、危险或失败等的忧虑。
参考例句
1. She always worries over her husband's health. 她总是为她丈夫的健康担心。
2. You worry too much. 你担心的太多了。
3. I worry every day. 我每天都会担忧。
英英解释
n.
1. something or someone that causes anxiety; a source of unhappiness
2. a strong feeling of anxiety v.
1. be worried, concerned, anxious, troubled, or uneasy
2. be concerned with
3. disturb the peace of mind of; afflict with mental agitation or distress
4. be on the mind of
5. lacerate by biting
6. touch or rub constantly
