这些都是预先测试版本,不适合生产使用。
These are pre-beta versions, not suitable for production use.
专为生产使用而设计,而且几乎没有性能影响。
Designed for production use but very little effect on performance.
虽然经过十多年生产使用,但却没出现其它有力的竞争对手。
After over a decade of production use, though, no other serious competitor has yet arisen.
It's not enough to understand the biology of how to create a vaccine, if you can't make enough of the vaccine or deliver it to people in ways that it's useful.
仅仅知道疫苗制造的,生物学原理是不够的,还得能生产出足够的疫苗,并在公众中广泛使用
Then, also emphasizing in the case of smallpox, how even after the scientific discovery was made, it took many, many decades for people to be able to produce the vaccine in large enough quantities and distribute it, so that you could think about making an impact on global prevalence of the disease.
同时重点就天花疫苗的发展展开了讨论,而即便当科学发现了天花病毒,仍然过了许多年,人类才能够,大规模生产并使用天花疫苗,由此你们可以了解到,在全球范围内,疫苗给天花以致命一击
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