A Very Useful Source 一个非常有用源码
Password cracking a very useful source.
一个非常实用的密码破解源码。
Multifunction calculator, a very useful source is not too long, the general use can be.
多功能的计算器，非常好用的源码不是太长，一般用是可以的。
To generate useful energy, plants have evolved very sophisticated "nano-machinery" which operates with light as its energy source and gives a perfect quantum yield of 100%.
为了产生有效能，植物进化出了异常精密的“纳米机器”，它以光为能量来源，光能转化率达到了完美的100％。
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