When you find yourself off a trail, but not in a completely unfamiliar area of land, you have to answer two questions: Which way is downhill, in this particular area?

当发现自己偏离路线，但又并非身处完全陌生的区域时，你要回答两个问题：在这片区域，哪边是下坡方向？

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There is not a simple answer. It depends on the subject and level of students,of course.

VOA: special.2009.12.17

And just as a fun aside, we also realized as computer scientists that sometimes technology is not the answer.

抛开趣味性不提，我们意识到作一个,计算机科学家来说技术,并不是我们要的最终答案。

哈佛公开课 - 计算机科学课程节选

So that would probably be de Broglie's answer for why, in fact, we're not observing the wavelength behavior of material on a day-to-day life.

所以那就可能是德布罗意关于,为什么我们无法再日常生活中,观测到物质的波动行为的答案。

麻省理工公开课 - 化学原理课程节选

Mandy Mathieson collapsed at her Moray home, but a technician at a nearby ambulance depot did not answer a call to go to her aid as he was on a break.

BBC: Mandy Mathieson

Despite repeated calls and emails to ask why Blackpool is not being promoted to international visitors, a satisfactory answer is not immediately forthcoming.

BBC: Blackpool: Why isn't it marketed to foreign tourists?

As a matter of economics, question does not have a simple answer.

FORBES: Economists Agree: High-Skilled Immigration Makes Americans Better Off