;
认;
的;Scientists cannot affirm the existence of life on other planets. She averred that solitude was necessary for creative work.
aver 强调讲话人对所讲东西正确性的自
：
，极力声明；主张Scientists cannot affirm the existence of life on other planets. She averred that solitude was necessary for creative work.
aver 强调讲话人对所讲东西正确性的自：
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