You are from Qingdao University! Learn 20,000 words first. If it's science and engineering (with code appendix), 60 pages is enough. If there are pictures in the design class, there will be many pages, depending on the number of your pictures, but not as many as 100 pages. If there are no pictures in English, it is estimated to be about 60 pages, because there is not much difference between Chinese characters translated by machine and English typesetting!