engaged in, expressing, or based on conjecture rather than knowledge
推测的,猜想的
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he gave her a speculative glance. 他向她投去狐疑的一瞥。
(of an investment)involving a high risk of loss
(投资)冒风险的
(of a business venture)undertaken on the chance of success, without a pre-existing contract
(生意上)投机的。