the unprecedented rise of new threats has deemed traditional security mechanisms both ineffective and unreliable in providing adequate defense.
新型威胁的空前增长表明传统安全机制难以提供充分的防御。
then the inventions and mass productions of that era gave rise in the 20th century to the information age and the knowledge economy, with an unprecedented rise in innovation and prosperity.
the length of the downturn (the longest since the depression) and the weakness of the recovery have combined to generate an unprecedented rise in the rate of long-term unemployment.
un agencies and the world bank pledged on tuesday to set up a task force to tackle an unprecedented rise in global food prices that is threatening to spread social unrest.