conjecture

关于外星生命的存在，目前仍然只是科学家们的猜测。

The existence of extraterrestrial life is still a matter of ___conjecture among scientists.

考古学家对这座古代石圈的作用只能提出基于推测的看法。

The archaeologists could only offer ___conjecture about the purpose of the ancient stone circle.

投资者认为那位分析师的预测不过是缺乏市场数据支撑的猜测而不予采信。

Investors dismissed the analyst's forecast as mere ___conjecture unsupported by market data.