The source codes that are found on the net are either too complex (20 + classes), or don't provide sufficient efficiency.

在网络上找到的源码要么太复杂(超过20个类)，要命没有提供足够的效率。

youdao

Energy efficiency (net energy gain or energy ratio) of corn-based ethanol as a substitute for fossil fuel is an important criteria for assessing its sustainability.

玉米燃料乙醇作为化石燃料的替代品，能量效率(净能量或能量比)是评价其可持续性的一个重要标准。

youdao

In brief, on net balance machines, technological improvements, automation, economies and efficiency do not throw men out of work.

总之，整体而言，机器、技术改进、自动化、降低成本和提高效率并不会使人失去工作。

youdao

It's breaking the rules, typically in small ways, to net you greater efficiency from the working systems you're stuck within.

BBC: Hacking work: How to break the rules to work better