After three hours of bootless negotiations, both sides agreed to meet again next week.

經過三小時徒勞無功的協商後，雙方同意下週再開會。

Our bootless search for the missing shipment finally ended when the carrier called us.

我們徒勞地尋找遺失的貨物，直到貨運公司來電才結束。

She made several bootless attempts to reach customer service before the line finally connected.

她數次徒勞地嘗試聯絡客服，最後電話才終於接通。