speculated
v.
思索，猜测，推测( speculate的过去式和过去分词 );
投机;
例句:
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The philosopher speculated about the future of the human race.
那位哲学家考虑过人类的前途.
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He speculated that he would succeed.
他推测他将成功。
来自《权威词典》
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We all speculated about the reasons for her resignation.
我们大家都推测过她辞职的原因。
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Media reports have speculated he received cancer treatments.
来自VOA
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What caused the distress in replication can only be speculated.
来自SA
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One can be observed, and one can be speculated.
来自SA