1 sentence for 开拍 (kāi​pāi — trading session)

1. 拍卖会一开拍，台下的竞买者就开始踊跃举牌。

   pāi​mài​huì yī kāi​pāi, tái xià de jìng​mài​zhě jiù kāi​shǐ yǒng​yuè jǔ pái.

   As soon as the bidding began at the auction, the bidders in the audience started to raise their paddles enthusiastically.

   Source: Dong Chinese Dictionary