The third phase, to test whether the vaccine prevents real infection, has not yet been carried out, as there has been no massive spread of H5N1 influenza in people.

第三阶段临床试验用于测试该疫苗是否能够预防真正的传染，由于现在人群中还没有出现大规模的H5N1禽流感传染，所以该阶段还没有实施。

youdao

Today, we are warning that unless we see a massive increase in the response, the famine will spread to five or six more regions.

今天，我们发出警告，除非我们大规模增加救助，否则这场饥荒会蔓延到五六个地区。

youdao

But "concocting rumors is itself a social malady, and the spread of rumors across the Internet presents a massive social threat."

但是与此同时“捏造谣言这个行为是社会上的歪风，互联网上谣言的散播对于社会是一个巨大的威胁”。

youdao

But he points to growing inequalities in adult mortality -- a "massive spread" between countries with the highest rates and those with the lowest.

VOA: special.2010.05.05

The largest transaction on the fund today was the purchase of a massive call butterfly spread in the December contract.

FORBES: RIMM Options Ripple With Bullish Speculation

Here are two credible threats to global systems: a massive cyber attack that could spread to the rest of world and interfere with SCADA systems everywhere and carbon whiskers that could short out power transmission systems.

FORBES: Why There Could Be Collateral Damage From An Israeli First Strike On Iran

The result was a massive collage that Mr. Warming spread across the wall outside his office.

WSJ: Anders Warming: The Man Who Reinvents Wheels | Creating