在底层系统技术以快速的步伐发生变化时，需求变动性就会大量地滋生；这会导致设计和组件的提早退化，否则它们是可重用的。
Requirements volatility stems largely from the rapid pace at which underlying system technologies change; this leads to early obsolescence of designs and components that might otherwise be reusable.
其实比所扬言的要简单得多。科学家们正在开发一种系统利用在污水容易滋生的细菌产生氧化氮，通过火箭推进器燃烧耗尽。
It's actually simpler than it sounds — the scientists are developing a system that exploits sewage-loving bacteria to produce nitrous oxide, which can be used up by a rocket thruster.
湿软的古尼罗河想必滋生了不少导致眼部感染的细菌，而这些眼妆的应用则帮助古埃及人加速了免疫系统的工作，从而无眼病之虞。
The ancient marshy Nile would have hosted many eye disease-causing bacteria. Application of the makeup may have revved up cells' immunity and protected against infection.
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