青云翻译

4 files minus 3 files: If the speed of file 4 of 40 km, we can consider quickly reduced to 3 files. Principle ibid.

4 minus 3 stalls: If a 4-speed at about 40 km at a speed of, it can be considered quickly reduced to 3. Principle as above.

4 grades reduce 3 grades: If 4 grades of speeds about 40 kilometers, may consider hurries to reduce to 3 grades.Principle same.

Document 4: If 4 minus 3stalls stalls around the speed at 40 km, you can consider hastened to 3 stalls. Schematic ibid.

4 minus 3 stalls: If a 4-speed at about 40 km at a speed of, it can be considered quickly reduced to 3. Principle as above.