人类是唯一只消耗而不生产的动物。

Man is the only creature that consumes without producing.

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准备运营的行业，代表已经准备好生产的设备，但目前不生产的公司。

Industries that are ready to operate, representing companies that have the plant and equipment ready for production, but are not currently producing.

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但是，一开始仅生产不添加牛奶，少糖的原味巧克力。

However, at first only plain chocolate (a kind of chocolate without milk and with very little sugar) was produced.

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So, that was a naturally occurring attenuated virus that could be produced into a vaccine that didn't cause the disease.

因为天花病毒存在天然的衰减病毒,这种衰减病毒可以用来,直接生产不致病的疫苗

耶鲁公开课 - 生物医学工程探索课程节选