来自《耶鲁大学开放课程：基础物理 第3集 第3集》

• 
  
  Yes?
  你说
• 
  
  Yeah.
  没错
• 
  
  Maybe that's an interesting thing.
  也许那会很有趣
• 
  
  That's correct.
  你说的没错
• 
  
  You can do that, too.
  你也可以那么做
• 
  
  Let me now put you out of your suspense.
  让我来消除你们的疑虑吧
• 
  
  I think I've heard bits and pieces of the answer everywhere,
  我想我可以听到各种各样的答案
• 
  
  so I don't want to wait until we get it word-perfect.
  所以我不想等这大家想出完美的答案
• 
  
  The point is, the one kilogram is a matter of convention.
  关键在于 1 千克已经定下来了
• 
  
  We want to know what is the mass of the elephant.
  我们想要知道大象的质量
• 
  
  We can do the seesaw experiment, you suggested,
  我们可以做你所说的跷跷板实验
• 
  
  but the seesaw experiment requires gravity,
  但跷跷板实验需要重力