you have to assume they are in," He says the more advanced a country is in its use of computers and the Internet, the more vulnerable it may be.

VOA: standard.2009.08.11

A vaccination, for it to work around the world, has to be inexpensive, transportable, possible to use without advanced medical personnel, and those kinds of things.

而疫苗接种,为了能适用于全世界,它必须便宜,便于运输,还要能在没有高级医生的情况下使用,它应该具有诸如此类的特点

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