ADJ-GRADED
（質(zhì)量、數(shù)量、規(guī)模）很高的，很大的
If you describe something as unprecedented, you are emphasizing that it is very great in quality, amount, or scale.
例句
Each home boasts an unprecedented level of quality throughout...
每家的質(zhì)量都堪稱一流。
The scheme has been hailed as an unprecedented success.
這個(gè)計(jì)劃廣受好評(píng)，被認(rèn)為是一個(gè)巨大的成功。