3 sentences

1. 这部科幻大片已经正式开拍了。

   zhè bù kē​huàn dà​piàn yǐ​jīng zhèng​shì kāi​pāi le.

   Filming has officially begun on this sci-fi blockbuster.

   Source: Dong Chinese Dictionary

2. 这件艺术品以一百万元起价开拍。

   zhè jiàn yì​shù​pǐn yǐ yī​bǎi​wàn yuán qǐ​jià kāi​pāi.

   The bidding for this artwork starts at one million yuan.

   Source: Dong Chinese Dictionary

3. 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