"Increase to several times" means that the quantity obtained after the change is several times the original quantity, that is, it is equal to several times the original quantity. For example, the current output is increased to 3 times of the original output, that is, the current output = the original output ×3. Other terms with the same meaning include "several times", "several times" and "increased to several times".

"Multiplying several times" means that the number of increased parts is several times that of the original, that is, "increasing several times". For example, the current output is three times higher than the original output, that is, the current output = original output+original output× 3 = original output× (1+3) = original output× 4. The same term means "increased several times"