详细解释:a. 空前的
【经】 空前的, 无前例的
词型变化：
副词:unprecedentedly英语解释：
形容词 unprecedented:
having no precedent; novel例句：
Science and technology have come to pervade every aspect of our lives and, as a result, society is changing at a speed which is quite unprecedented.科学和技术已经开始渗透了我们生活的各个领域; 结果，社会正以空前的速度改变着。