來自古英語 thaerfore,為了，因為，因此，來自 there,那裏，fore,為了，來自 for 在古英語的 拚寫變體。
英文詞源
therefore (adv.)
Old English þærfore; from there + fore, Old English and Middle English collateral form of for. Since c. 1800, therefor has been used in sense of "for that, by reason of that;" and therefore in sense of "in consequence of that." Similar formation in Dutch daarfoor, German dafür, Danish derfor.
雙語例句
1. The truth is that junk bonds were misnamed, and therefore misunderstood.
事實上人們對垃圾債券的稱謂有誤，所以產生了誤解。
來自柯林斯例句
2. They had seen him trawling and therefore knew that there were fish.
他們曾見過他用拖網捕魚，因此知道那裏有魚。
來自柯林斯例句
3. Men are anxious to improve their circumstances, but are unwilling to improve themselves; they therefore remain bound.--James Allen
人們總是渴望改善周遭環境，但是卻不願意改善自己，因此總停留在原地，無法進步。
來自金山詞霸 每日一句
4. He's only 17 and therefore not eligible to vote.
他隻有17歲，因此沒有投票選舉的資格。
來自《權威詞典》
5. He lost his health, and therefore his difficulties increased.