unprecedented /ˌʌnˈprɛsəˌdɛntəd/ adjective /ˌʌnˈprɛsəˌdɛntəd/
adjective
Learner's definition of UNPRECEDENTED
: not done or experienced before前所未有的;史无前例的;空前的 -
The team has enjoyed unprecedented success this year.这支球队今年取得了空前的成功。
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This level of growth is unprecedented.这种增长速度是前所未有的。
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An unprecedented number of students are taking the class.选修这门课的学生比以前任何时候都多。