adj. 从未听见过的，前所未闻的，空前的。 on an unheard-of scale 以空前的规模。
Example Sentences:
1.
You've done deeds of unheard-of bravery . 你已经做了空前勇敢的事。
2.
What he said is really an unheard-of fantastic story . 他讲的真是千古奇闻。
3.
We are developing our production at a speed unheard-of before . 我们正以前所未闻的速度发展生产。
4.
A guest to stop at iping in the wintertime was an unheard-of piece of luck . 冬天居然会有客人上伊滨来住，这真是闻所未闻的好运气。
5.
My mother luckily secured a job in a white doctor's office at the unheard-of wages of five dollars per week . 妈妈很幸运，在一个白人医生的诊所里找到了工作，工资是每周五元，这是前所未有的。
6.
Rudolph played club dates at dances and axel had advanced him the money for a tuxedo, thirty-five dollars, an unheard-of outpouring . 鲁道夫在俱乐部举办舞会的日子参加演奏，阿克赛尔给他一笔钱做夜礼服一共三十五元，象这样慷慨解囊是从来不曾听说过的。
