speculate

猜测，推测；投机英释vvto guess about the possible causes or effects of something, without knowing all the facts or details

1 speculate on,v. 推测；考虑

1 Jones refused to speculate about what might happen..琼斯拒绝猜测可能会发生什么事情。

2 He speculated in stocks..他炒股票。