Definition
used to indicate that a mistake made was not one's fault because of a lack of prior knowledge or information
（用於表示所犯錯誤並非自己的過失）我怎麼會知道？
I was just trying to help; how was I to know the software had a bug?
我只是想幫忙；我怎麼會知道軟體有漏洞？
I thought he would like it; how was I to know he was allergic to it?
我以為他會喜歡；我怎麼會知道他對這個過敏？
The situation was urgent at the time; how was I to know it was the wrong decision?
當時情況緊急；我怎麼會知道這是錯誤的決定？