After three futile attempts to reach the supplier, Maria escalated the issue to her manager.

瑪麗亞三次試圖聯絡供應商都徒勞無功後，便把問題上報給她的主管。

The team's efforts to save the failing merger proved futile despite weeks of negotiations.

儘管經過數週協商，團隊挽救失敗併購案的努力仍是徒勞。

Calling the airline again seemed futile, so we booked a hotel near the airport.

再打電話給航空公司似乎也沒用，所以我們在機場附近訂了飯店。