He says that brain change is strongest when a) you are interested in and like what you are learning, b) you are in control of what you learn and c) you get challenging tasks that make you think hard.

他说，当你 a）对你正在学习的东西感兴趣并且喜欢它，b）你能控制你所学的东西，c）你接受有挑战性、让你努力思考的任务时，大脑的变化是最剧烈的。

youdao

The work is not nearly as intellectually challenging as what they will face in the OOAD class, but it lays the groundwork for team collaboration, which is a major learning goal.

在智力挑战层面上这一工作与他们将在OOAD课上面对的东西联系并不密切，但是它为团队协作奠定了基础，这是一个主要的学习目标。

youdao

Parkour is a challenging and demanding discipline, therefore learning Parkour must always be approached with sensibility and caution.

酷是一项充满挑战和危险的体育项目，因此学习跑酷时必须时刻保持清醒和敏感。

youdao