Our fortuitous meeting with the supplier at the airport led to a new contract.

我們在機場與供應商的偶然相遇，促成了一份新合約。

The timing of the price drop was fortuitous, since we had just placed a large order.

降價的時機純屬偶然，因為我們剛好下了一筆大訂單。

Finding the missing invoice in the old file was fortuitous, not the result of careful searching.

在舊檔案裡找到遺失的發票純屬偶然，並非仔細搜尋的結果。