，断言;
, 
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
自信：
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自信：
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