诺华发明的禽流感疫苗利用了模拟病毒大小和形状的颗粒，这足以激发免疫应答但并不含有病毒复制需要的遗传物质。
Novavax's bird flu vaccine uses particles that mimic the size and shape of the virus, which trigger an immune response but lack the genetic material to replicate.
病毒很难被发现，其中一个原因是因为他们都很微小——通常只有百万分之一英寸大小。
One reason that viruses can be so hard to find is that they're so small - typically a few millionths of an inch across.
但是，假如将地球缩成细菌大小，放在高倍显微镜下观察，它能比病毒更奇怪吗？
But if Earth is reduced to the size of a bacteria, and inspected under high-powered optics, would it seem stranger than a virus?
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