So the challenge thing comes back to the instruction of designer: what are you for on this access?

这样，教育设计者,又重新面临着挑战：,你会支持这项技术吗？

麻省理工公开课 - 媒体、教育、市场课程节选

The question is what it means to say something is backed by something because well you could say it's backed by gold because the Fed has eleven billion dollars of gold.

问题在于，说某个东西被另一个东西支持,意味着，你可以说,货币被金子支持着,因为美联储有一百一十亿美元的金子。

耶鲁公开课 - 金融市场课程节选