adj.前所未有的,无前例的;空前的;无比的;新奇的,崭新的;
例句:
The scheme has been hailed as an unprecedented success.
这个计划广受好评,被认为是一个巨大的成功。
Each home boasts an unprecedented level of quality throughout...
每家的质量都堪称一流。
This achievement is surely unprecedented.
这成就确实是空前的.