There has never been a case of a large number of new virus directly from the membrane.

从来没有一个例子是大批新病毒直接脱离胞膜。

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In fact, there has never been a case of recovery spontaneously aborting in Britain through lack of consumer demand.

事实上，在英国从来还未因为缺乏消费需求而造成自发性中断经济恢复的情况。

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There has never been a documented human case of such brain disease linked to consumption of U.S. beef.

到目前为止，还没有出现人类因为食用美国牛肉感染疯牛病的案例。

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However, the state government conceded that there has never been a known case of in-person voter fraud.

BBC: Judge blocks Pennsylvania voter ID law before election

The critics point out that there has never been a documented case of voter impersonation in Indiana, and that mail-in voting is more prone to fraud.

ECONOMIST: Voting rules

Marshall Shnider says that his are tested twice a week, and moreover that there has never, ever been a case of vibrio from a farmed Pacific Northwest oyster.

FORBES: A Giant Shucking Sound