Nonperiodicity
非周期性
??? 情景例句
I don't believe it!
我簡直難以相信！
He is unworthy to live who lives only for himself.
為己而生，生而可恥。
but we were afraid that the strength of the current would prevent its landing anywhere before it became exhausted.
但我們擔(dān)心，洪水力量將使它上岸之前就筋疲力盡了。