For some of these diseases, we have powerful and safe medicines for use in mass prevention campaigns.

就上述疾病中的某些而言，我们已具备强效和安全的药物，可用于开展大规模预防运动。

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This very low base-rate means that any precursors of a quake would have to be incredibly reliable if decision-makers are to feel safe in using them to order mass evacuations.

这么低的基础概率意味着，如果要让决策者下定决心，进行大规模人口疏散的话，任何地震前兆都必须极其可靠。

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For zero nukes would make no sense if this left the world safe for the sorts of mass conventional warfare that consumed the first half of the 20th century.

如果说零核武意味着是使世界对于充斥20世纪上半页那样的传统大规模战事更加安全，那么它是毫无意义的。

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Mr Hilleman's greatest contribution to a healthy world may have been his work on the safe mass production of vaccines that can be stored ready for use against the pandemics that since antiquity have regularly swept across continents, such as the 1918 flu outbreak that killed more than 20m people.

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The roundtable was part of the Obama Administration's ongoing conversations with Americans on all sides of this debate about how we can work together to keep our kids safe, help prevent mass shootings, and reduce the broader epidemic of gun violence in this country.

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These actions are the result of the effort led by Vice President Joe Biden and members of the Cabinet to come up with concrete steps that we can take right now to keep our children safe, help prevent mass shootings, and reduce the broader epidemic of gun violence in this country.

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