Blackboard is the most widely used online virtual learning system in British universities.

Blackboard also has its own paper duplicate checking function, that is, every time you submit your homework, you will re-enter the submission page after about 5 minutes, and the similarity will appear on the left side of the view. If it's green, it's safe. If it is a yellow light or even a red light, it means that you have cited too much or are suspected of plagiarism, and you need to delete the cited part and resubmit it. However, it should be noted that you only have one chance to resubmit, and you will not see similarities after submitting.