名詞 speculation:

1. a message expressing an opinion based on incomplete evidence
   同義詞：guess, conjecture, supposition, surmise, surmisal, hypothesis
2. a hypothesis that has been formed by speculating or conjecturing (usually with little hard evidence)
   同義詞：conjecture
3. an investment that is very risky but could yield great profits
   同義詞：venture
4. continuous and profound contemplation or musing on a subject or series of subjects of a deep or abstruse nature
   同義詞：meditation

1. Speculation has reached such a pitch that a decision will have to be made immediately.
   這種胡亂猜測甚囂塵上，已經到了必須立即解決的程度了。
2. She lose all her money in stock exchange speculation.
   她將所有的錢賠進了股票投機生意。
3. They have much speculation over the cause of the air crash.
   他們對飛機墜毀原因有多方推測。
4. My speculations proved totally wrong.
   我猜想的全錯了。
5. He makes some unprofitable speculations.
   他在做些無利可圖的投機生意。