局限性：很少要求符合的研究得以确认。PS A假阳性筛查结果的长期不良影响未知。
Limitations: Few eligible studies were identified. Long-term adverse effects of false-positive PSA screening test results are unknown.
这种未命名的新人种是首例仅通过DNA得以确认的，在本周的《自然》杂志上发布了它的消息。
The new, as yet unnamed species-the first to be defined solely by its dna-is unveiled in this week's Nature.
而且直到现代微生物学技术的出现方使每一种病毒得以确认，至此这些病毒已至少可被分离出来。
And each had gone unrecognized until the advent of modern microbiological techniques, when the viruses could at least be isolated.
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