The banks made too many risky loans which now can't be repaid, and they speculated in property whose value has now dropped.

银行贷出了太多现在无法偿还的风险贷款，而且他们在房地产业做了投机买卖，其价值目前也已经下跌。

《柯林斯英汉双解大词典》

This is most probably because the increase in neural activity weakens the fly's life-support systems, they speculated.

据科学家推测，这可能是因为神经系统活动的增多会削弱苍蝇的生命支持系统。

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They speculated heavily in real estate.

他们大量投机炒作房地产。

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Some scholars have even speculated that Christians may have been the first to do this, because they were arguing with their friends,the Jews.

有些学者甚至推测,基督教徒是首先这样做的，因为他们在和犹太朋友争辩时。

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One monkey that was unaccounted for might have been eaten by one of the big cats, they speculated.

CNN: Widow of man who freed exotic animals to get them back

They speculated that consumer activist groups could use smart tags viruses to cause havoc at stores they are targeting.

BBC: NEWS | Technology | Viruses leap to smart radio tags

It seems that my candidacy had been called into question by some on the panel because they had speculated I was gay.

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