解釋：
driving force
英[?draivi? f?:s] 美[?dra?v? f?rs]
[詞典] 驅動力;
[例句]This can become a driving force for social advance.
這能成為促使社會前進的動力。
effort 英[?ef?t] 美[?ef?rt]
n. 工作; 努力，嘗試; 成就; 傑作;
[例句]He made no effort to hide his disappointment
他毫不掩飾失望之情。