只去掉as: but this is yet unconfirmed 不能理解成
but this has been confirmed 吧？ 记得yet 通常用在否定句中。
unconfirmed 具有否定意义，我认为 but this is yet unconfirmed 理解成
but this is not confirmed.

【 在 histospring 的大作中提到: 】
: as (of) yet:
: used when saying that something has not happened up to now
: confirmed    adjective
: ...................
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