;
认;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信：
，
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信：
声明：以上例句、词性
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