un·prec·e·dent·ed /ˌʌnˈprɛsəˌdɛntəd/
(a.)空前的
Un·prec·e·dent·ed a. Having no precedent or example; not preceded by a like case; not having the authority of prior example; novel; new; unexampled. -- Un*prec*e*dent*ed*ly, adv.
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unprecedented
adj : having no precedent; novel; "an unprecedented expansion in
population and industry" [ant: precedented]