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。
B: Because the job wasn't challenging enough.
因为那份工作挑战性不够。
B: it sounds like a challenging position.
看来这一职位极富挑战性。
One of the most challenging open problems in heavy quarkonium physics is the double charm production in annihilation at B factories.
B 工厂中通过双的单举和遍举的产生是重夸克偶素物理中的一个具有很大挑战性的课题。
B: well, this is a challenging question.
B：这个问题很有挑战性。
B: well, this is a challenging question.
B：这个问题很有挑战性。
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