n.[U][C]

1. 思索；沉思；推測[（+about/on/upon）]
   There has been a great deal of speculation about the Prime Minister's resignation.

   最近有關首相辭職的臆測頗多。

2. 投機；投機買賣[（+in）]
   His speculations in stocks led to his bankruptcy.

   他在股票上做投機買賣致使他破產。