很多系统的设计会走向极端：缺乏抽象的冗长的代码，或是充斥着复杂的从不使用的代码。
Lots of systems suffer from the extremes: clumped, lengthy code with little abstractions, or an overly designed system with unnecessary complexity and unused code.
任务分析是使生物课堂教学设计走向科学化、系统化和正规化的一项重要的教学理论与技术。
This paper tries to discuss how to apply task analysis to biology teaching design in the middle school.
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