Definition: never having happened before Level: C2
互联网时代让我们得以前所未有地获取全球知识。
The age of the Internet has given us ___unprecedented access to global knowledge.
一次核事故可能造成前所未有的环境破坏。
A nuclear accident could cause ___unprecedented environmental damage.
这项新技术有望实现效率的跨越式提升。
The new technology promises an ___unprecedented leap in efficiency.
