Hi 李泽民. Amid means something is happening around you and it surrounds you, but you are not part of the action. For example: Jensen and Scott both left their positions last year amid questions about their spending. (There were many questions that they surrounded Jensen and Scott) Among is similar, except that you act with the things that surround you. For example: These products have generated lively arguments among the testers since they were first introduced. (The testers are having arguments together as a group.) Among has a stronger feeling as being part of the action. I hope this helps!