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. You can still your anxiety by listening to some music. 你听听音乐以消除内心的不安，平静下来。
2. Fear and anxiety have always been a part of life and always will be. 恐惧与焦虑早就是生活的一部分，而且也将永远如此。
3. Gender difference is the importance variable that influences computer anxiety. 性别差异是影响计算机焦虑的重要变量。
英英解释
n.
1. a relatively permanent state of anxiety occurring in a variety of mental disorders
2. a vague unpleasant emotion that is experienced in anticipation of some (usually ill-defined) misfort
