If improved education is combined with other factors dramatic results can be achieved.如果教育得到改善, 再加上其他因素, 将会带来显著的成效。

A stagnant economy combined with a surge in the number of teenagers is likely to have contributed to rising crime levels in the U.S.经济发展停滞不前, 加之青少年人数激增, 可能是美国犯罪率上升的部分原因。