Anxiety is actually translated very easily into Chinese - 焦虑. In this case, "to some value" means "to the level that". But the definition here is poorly written. Anxiety is not just "an emotional response" - it is also a physical response to stress. 应激反应 I teach English on iTalki, so I must tell you that I am available for classes! :)

according to my medical education, I can tell you that anxiety is a very broad term and you can't explain it by a single word. what I think about anxiety is what you experience during exam days. psychologically, you have some sleep disturbances, restessness and concentration problems. your body also responses to anxiety through sweating, shortness of breath and in serious occasions palpitation and shivering. I agree you that all these reposes from your body is that it tries to defend yourself from emotional threats

焦虑，是对威胁的一种情绪化的反应，这种威胁是针对某种价值观而言的，持有这种价值观的人把他生存的基本要素当做个性所需。 我尽力了。。。

焦虑，是对威胁的一种情绪化的反应，这种威胁是针对某种价值观而言的，持有这种价值观的人把他生存的基本要素当做个性所需。 我尽力了。。。