speculation [ˌspɛkjəˈleʃən]

例句:

• It's a fun topic, but still speculation.
  来自SA
• Speculation centred on a likely bid price of 380p a share.
  大多数人猜测买方出价可能为每股380便士。
  
• The group's problems have led to speculation that heads will roll.
  已经有人猜测，该集团的问题会导致一些人被解雇。
  
• Sheer speculation, sir, and very little science.
  来自SA
• Oil speculation proved a natural arena for his skills.
  在石油业中进行投机活动对他来说游刃有余。
  
• Theory in science does not mean "speculation".
  来自SA