I mean, to the extent that you're making these short-term bets against your long-term policy, it requires trading and trading is expensive.

我的意思是,在长期策略下进行短期操作,就需要进行交易,而交易是昂贵的

耶鲁公开课 - 金融市场课程节选

It requires life-long learning.

这就需要我们进行终身学习。

麻省理工公开课 - 媒体、教育、市场课程节选

There sometimes will be homework assignments which sort of build on what we've done during the section but it's not a lab in that sense that it's a long experience in the afternoon or that requires any detailed reports.

有时候我们会有家庭作业,是关于这部分内容的,但这不是那种需要在实验室呆一整个下午,要提交细节翔实的报告的那种实验

耶鲁公开课 - 生物医学工程探索课程节选