C2 to guess possible answers to a question when you do not have enough information to be certain猜测;推测,推断
More examples
It's useless to speculate without more information.
Royal-watchers have once again been speculating on the health of the princess.
Scientists have speculated about the possibility of parallel universes.
to buy and sell in the hope that the value of what you buy will increase and that it can then be sold at a higher price in order to make a profit投机,做投机买卖
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