不过，这一基于任务的语言学习需要研究者设计系统时做出一些调整。
But the idea — known as task-based language learning — required a few changes as the researchers were designing the system.
可学习性：初次接触这个设计时，用户完成基本任务的难易程度。
Learnability: How easy is it for users to accomplish basic tasks the first time they encounter the design?
春节期间，他设计一个灵活的时间表，把学习和娱乐结合起来，那么他既能完成学术任务，也能享受一系列每年一次的音乐会。
During the Spring Festival, he designed a flexible schedule where he combined the study with entertainment so that he could accomplish the academic task as well as enjoy a series of annual concerts.
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