English paper duplicate checking system usually takes words as the basic unit to calculate. First, the system divides the paper into words and calculates the number of times each word appears in the whole paper. Then the system will compare each word in the paper to see if it has appeared in other documents. If a word appears in other documents at the same time, the system will determine that this part of the content is repeated.
In addition to word comparison, the duplicate checking system will also detect duplicate content by comparing phrases, sentences, paragraphs and even the whole paper. The system will give the duplicate checking results in the form of similarity. The higher the similarity, the more similar the content in the paper is to other documents.
However, it is very difficult to calculate the duplicate checking results of English test papers completely and accurately. The duplicate checking system can only judge the similarity by comparing the texts in papers and other documents. It can't identify the repetition of academic thoughts, and it can't judge whether some quotations are reasonable. Therefore, when using the duplicate checking system, we also need to make manual judgment and analysis to confirm whether there is plagiarism.
To sum up, the duplicate checking of English papers is carried out through the duplicate checking system. The system compares words as the basic unit, and judges similarity and repetition by comparing papers with other documents. However, it should be noted that the duplicate checking system is only an auxiliary tool, and the final judgment needs to be made manually.